1
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Xie Z, Cai Y, Tang M, Zhou J, Liu J, Peng J, Jiang T, Shi Z, Chen Z. Fluence and Temperature Dependences of Laser-Induced Ultrafast Demagnetization and Recovery Dynamics in L1 0-FePt Thin Film. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5086. [PMID: 37512360 PMCID: PMC10385860 DOI: 10.3390/ma16145086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 07/08/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023]
Abstract
The fundamental mechanisms of ultrafast demagnetization and magnetization recovery processes in ferromagnetic materials remain incompletely understood. The investigation of different dynamic features which depend on various physical quantities requires a more systematic approach. Here, the femtosecond laser-induced demagnetization and recovery dynamics in L10-Fe0.5Pt0.5 alloy film are studied by utilizing time-resolved magneto-optical Kerr measurements, focusing on their dependences of excitation fluence and ambient temperature over broad ranges. Ultrafast demagnetization dominated by Elliott-Yafet spin-flip scattering, and two-step magnetization recovery processes are found to be involved in all observations. The fast recovery time corresponding to spin-lattice relaxation is much shorter than that of many ferromagnets and increase with excitation fluence. These can be ascribed to the strong spin-orbit coupling (SOC) demonstrated in FePt and the reduction of transient magnetic anisotropy, respectively. Surprisingly, the demagnetization time exhibits no discernible correlation with ambient temperature. Two competitive factors are proposed to account for this phenomenon. On the other hand, the spin-lattice relaxation accelerates as temperature decreases due to enhanced SOC at lower ambient temperature. A semiquantitative analysis is given to get a visualized understanding. These results offer a comprehensive understanding of the dynamic characteristics of ultrafast demagnetization and recovery processes in iron-based materials with strong SOC, highlighting the potential for regulating the magnetization recovery process through temperature and laser fluence adjustments.
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Affiliation(s)
- Zhikun Xie
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
- State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yuanhai Cai
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
| | - Meng Tang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Jielin Zhou
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
| | - Junhao Liu
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
| | - Jun Peng
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
| | - Tianran Jiang
- State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
| | - Zhong Shi
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Zhifeng Chen
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
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2
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Dai Y, Zhao YW, Ma L, Tang M, Qiu XP, Liu Y, Yuan Z, Zhou SM. Fourfold Anisotropic Magnetoresistance of L1_{0} FePt Due to Relaxation Time Anisotropy. PHYSICAL REVIEW LETTERS 2022; 128:247202. [PMID: 35776447 DOI: 10.1103/physrevlett.128.247202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 04/06/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
Experimental measurements show that the angular dependence of the anisotropic magnetoresistance (AMR) in L1_{0} ordered FePt epitaxial films on the current orientation and magnetization direction is a superposition of the corresponding dependences of twofold and fourfold symmetries. The twofold AMR exhibits a strong dependence on the current orientation, whereas the fourfold term only depends on the magnetization direction in the crystal and is independent of the current orientation. First-principles calculations reveal that the fourfold AMR arises from the relaxation time anisotropy due to the variation of the density of states near the Fermi energy under rotation of the magnetization. This relaxation time anisotropy is a universal property in ferromagnetic metals and determines other anisotropic physical properties that are observable in experiment.
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Affiliation(s)
- Y Dai
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Y W Zhao
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - L Ma
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - M Tang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - X P Qiu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Y Liu
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Z Yuan
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - S M Zhou
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
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3
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Jiang N, Yang B, Bai Y, Jiang Y, Zhao S. The sign reversal of anomalous Hall effect derived from the transformation of scattering effect in cluster-assembled Ni 0.8Fe 0.2 nanostructural films. NANOSCALE 2021; 13:11817-11826. [PMID: 34160537 DOI: 10.1039/d1nr02313f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Both surface and interface scattering induced a sign reversal of the anomalous Hall effect (AHE) in a few heterostructures. The sign reversal existing in a single substance can clarify the role of the surface scattering in the AHE. Here, cluster-assembled Ni0.8Fe0.2 single-substance films prepared by low-energy cluster beam deposition greatly improved the surface effect with cluster size below a characteristic size of 16.17 nm (dc) due to the high surface-to-volume ratio of the clusters and the loose structure of the films. The films presented a sign reversal of AHE and unusual transitional behavior in temperature- and size-dependent anomalous Hall resistivity with dc as the critical size. Interestingly, we also observed the sign reversal in the same film with a cluster size of dc by regulating the temperature. Based on the existing and modified scaling laws, we discovered the transformation between the bulk and surface scattering mechanisms and their coexistence, and both the sign reversal of AHE and the unusual transitional behaviors of anomalous Hall resistivity were attributed to the predominant scattering effects. Temperature- and size-dependent magnetoresistance (MR) also displayed a significant transformation at dc and further confirm the transitional mechanisms of AHE. This work provides an effective method for regulating AHE to promote its application in spintronic nano-devices.
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Affiliation(s)
- Ning Jiang
- School of Physical Science and Technology, & Inner Mongolia Key Lab of Nanoscience and Nanotechnology, Inner Mongolia University, Hohhot 010021, PR China.
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Guo Q, Wang Z. Temperature assistance of electric field-controlled spin–orbit torque-based magnetization switching in PMN–PT/FePt heterostructures. RSC Adv 2021; 11:12043-12050. [PMID: 35423760 PMCID: PMC8697033 DOI: 10.1039/d1ra00919b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 03/10/2021] [Indexed: 11/21/2022] Open
Abstract
E-field has an improved regulating effect on PMA and SOT-based current induced magnetization switching of PMN–PT/FePt heterostructures.
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Affiliation(s)
- Qi Guo
- School of Materials Science and Engineering
- Taiyuan University of Science and Technology
- Taiyuan 030024
- China
| | - Zhicheng Wang
- School of Materials Science and Engineering
- Taiyuan University of Science and Technology
- Taiyuan 030024
- China
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5
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Shen J, Yao Q, Zeng Q, Sun H, Xi X, Wu G, Wang W, Shen B, Liu Q, Liu E. Local Disorder-Induced Elevation of Intrinsic Anomalous Hall Conductance in an Electron-Doped Magnetic Weyl Semimetal. PHYSICAL REVIEW LETTERS 2020; 125:086602. [PMID: 32909775 DOI: 10.1103/physrevlett.125.086602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 05/14/2020] [Accepted: 07/10/2020] [Indexed: 06/11/2023]
Abstract
Topological materials are expected to show distinct transport signatures owing to their unique band-inversion characteristic and band-crossing points. However, the intentional modulation of such topological responses through experimentally feasible means has yet to be explored in depth. Here, an unusual elevation of the anomalous Hall effect (AHE) is obtained in electron (Ni)-doped magnetic Weyl semimetals Co_{3-x}Ni_{x}Sn_{2}S_{2}, showing peak values in the anomalous Hall-conductivity, Hall-angle, and Hall-factor at a relatively low doping level of x=0.11. The separation of intrinsic and extrinsic contributions using the TYJ scaling model indicates that such a significant enhancement is dominated by the intrinsic mechanism of the electronic Berry curvature. Theoretical calculations reveal that compared with the Fermi-level shifting from electron filling, a usually overlooked effect of doping, that is, local disorder, imposes a striking effect on broadening of the bands and narrowing of the inverted gap, thus resulting in an elevation of the integrated Berry curvature. Our results not only realize an enhancement of the AHE in a magnetic Weyl semimetal, but also provide a practical design principle for modulating the bands and transport properties in topological materials by exploiting the local disorder effect from doping.
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Affiliation(s)
- Jianlei Shen
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiushi Yao
- Shenzhen Institute for Quantum Science and Technology and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qingqi Zeng
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongyi Sun
- Shenzhen Institute for Quantum Science and Technology and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xuekui Xi
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Guangheng Wu
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Wenhong Wang
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Baogen Shen
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Institute of Rare Earths, Chinese Academy of Sciences, Jiangxi 341000, China
| | - Qihang Liu
- Shenzhen Institute for Quantum Science and Technology and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Guangdong Provincial Key Laboratory for Computational Science and Material Design, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of for Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Enke Liu
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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6
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Tang M, Shen K, Xu S, Yang H, Hu S, Lü W, Li C, Li M, Yuan Z, Pennycook SJ, Xia K, Manchon A, Zhou S, Qiu X. Bulk Spin Torque-Driven Perpendicular Magnetization Switching in L1 0 FePt Single Layer. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002607. [PMID: 32596934 DOI: 10.1002/adma.202002607] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/04/2020] [Indexed: 06/11/2023]
Abstract
Due to its inherent superior perpendicular magnetocrystalline anisotropy, the FePt in L10 phase enables magnetic storage and memory devices with ultrahigh capacity. However, reversing the FePt magnetic state, and therefore encoding information, has proven to be extremely difficult. Here, it is demonstrated that an electric current can exert a large spin torque on an L10 FePt magnet, ultimately leading to reversible magnetization switching. The spin torque monotonically increases with increasing FePt thickness, exhibiting a bulk characteristic. Meanwhile, the spin torque effective fields and switching efficiency increase as the FePt approaches higher chemical ordering with stronger spin-orbit coupling. The symmetry breaking that generates spin torque within L10 FePt is shown to arise from an inherent structural gradient along the film normal direction. By artificially reversing the structural gradient, an opposite spin torque effect in L10 FePt is demonstrated. At last, the role of the disorder gradient in generating a substantial torque in a single ferromagnet is supported by theoretical calculations. These results will push forward the frontier of material systems for generating spin torques and will have a transformative impact on magnetic storage and spin memory devices with simple architecture, ultrahigh density, and readily application.
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Affiliation(s)
- Meng Tang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Ka Shen
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Shijie Xu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Huanglin Yang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Shuai Hu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Weiming Lü
- Spintronics Institute, University of Jinan, Jinan, 250022, China
- Condensed Matter Science and Technology Institute, School of Science, Harbin Institute of Technology, Harbin, 150081, China
| | - Changjian Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Mengsha Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Zhe Yuan
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Stephen J Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Ke Xia
- Beijing Computational Science Research Center, Beijing, 100193, China
| | - Aurelien Manchon
- Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
- Aix-Marseille Université, CNRS, CINaM, Marseille, 13288, France
| | - Shiming Zhou
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Xuepeng Qiu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
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7
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Chen A, Zhang S, Wen Y, Huang H, Kosel J, Lu Y, Zhang XX. Electric-Field-Enhanced Bulk Perpendicular Magnetic Anisotropy in GdFe/Pb(Mg 1/3Nb 2/3) 0.7Ti 0.3O 3 Multiferroic Heterostructure. ACS APPLIED MATERIALS & INTERFACES 2019; 11:47091-47097. [PMID: 31736291 DOI: 10.1021/acsami.9b16904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Perpendicular magnetic anisotropy is important for increasing the information storage density in the perpendicular magnetic recording media, and for rare-earth-transition-metal alloys with bulk perpendicular magnetic anisotropy that generate great research interest due to their abundant interesting phenomena, such as fast domain wall motion and skyrmion. Here, we deposit amorphous GdFe ferrimagnetic films on Pb(Mg1/3Nb2/3)0.7Ti0.3O3 ferroelectric substrate and investigate the effect of electric-field-induced piezostrain on its bulk perpendicular magnetic anisotropy. The anomalous Hall effect and polar Kerr image measurements suggest an enhanced bulk perpendicular magnetic anisotropy by electric field, which originates from a positive magnetoelastic anisotropy due to the positive magnetostriction coefficient of the GdFe film and the electric-field-induced tensile strain along the z axis in Pb(Mg1/3Nb2/3)0.7Ti0.3O3 ferroelectric substrate. Our results enrich the electrical control of perpendicular magnetic anisotropy and are useful for designing spintronic devices based on perpendicular magnetic anisotropy.
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Affiliation(s)
| | | | | | - Haoliang Huang
- Anhui Laboratory of Advanced Photon Science and Technology, National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei 230026 , China
| | | | - Yalin Lu
- Anhui Laboratory of Advanced Photon Science and Technology, National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei 230026 , China
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8
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Zhang J, Peng W, Yu G, He Z, Yang F, Ji W, Hu C, Wang S. Tunable Giant Anomalous Hall Angle in Perpendicular Multilayers by Interfacial Orbital Hybridization. ACS APPLIED MATERIALS & INTERFACES 2019; 11:24751-24756. [PMID: 31246392 DOI: 10.1021/acsami.9b06204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A spintronic device based on the spin-dependent Hall effect has attracted great interest because of its great potential applications in the multivalue storage and logic gate, which is a promising candidate to break the bottleneck of the information industry in the big data period. It is a technological challenge to implant spintronic devices into semiconductor integrated circuits. The anomalous Hall angle (θ), defined as the deviation of the electron flow from the current direction, is the key parameter to evaluate the capacity of Hall device compatibility. However, the bottleneck for the device is low θ (less than 5%) at room temperature (RT), making it difficult to directly complement with the semiconductor circuit which limits its potential application. Here, we report a simple perpendicular multilayered structure with θ up to 5.1% at RT. Wide working temperature (250-350 K) across RT for our samples will accelerate the potential applications in spintronic memory. A giant Hall angle at RT originates from the enhanced side-jump scattering at the atomic-scale-modified interfacial structure. The high θ at RT together with wide working temperature is practically significant and may provide the way for further 3D spintronic devices based on the spin-dependent Hall effect with ultrahigh storage density and ultralow power consumption.
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Affiliation(s)
| | | | | | | | - Feng Yang
- Department of Physics , Renmin University of China , Beijing 100872 , China
| | - Wei Ji
- Department of Physics , Renmin University of China , Beijing 100872 , China
| | - Chen Hu
- Department of Physics , McGill University , Montreal H3A2T8 , Canada
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9
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Bai X, Chen W, Zhao C, Li S, Song Y, Ge R, Wei W, Sun Y. Exclusive Formation of Formic Acid from CO2
Electroreduction by a Tunable Pd-Sn Alloy. Angew Chem Int Ed Engl 2017; 56:12219-12223. [DOI: 10.1002/anie.201707098] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaofang Bai
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Wei Chen
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Chengcheng Zhao
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Shenggang Li
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
| | - Yanfang Song
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Ruipeng Ge
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Wei Wei
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
| | - Yuhan Sun
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
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10
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Bai X, Chen W, Zhao C, Li S, Song Y, Ge R, Wei W, Sun Y. Exclusive Formation of Formic Acid from CO2
Electroreduction by a Tunable Pd-Sn Alloy. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707098] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaofang Bai
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Wei Chen
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Chengcheng Zhao
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Shenggang Li
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
| | - Yanfang Song
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Ruipeng Ge
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
| | - Wei Wei
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
| | - Yuhan Sun
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering; Shanghai Advanced Research Institute; Chinese Academy of Sciences; 100 Haike Road Shanghai 201203 P. R. China
- School of Physical Science and Technology; ShanghaiTech University; 393 Middle Huaxia Road Shanghai 201210 P. R. China
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11
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Nonvolatile modulation of electronic structure and correlative magnetism of L10-FePt films using significant strain induced by shape memory substrates. Sci Rep 2016; 6:20199. [PMID: 26830325 PMCID: PMC4735331 DOI: 10.1038/srep20199] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 12/23/2015] [Indexed: 11/08/2022] Open
Abstract
Tuning the lattice strain (εL) is a novel approach to manipulate the magnetic, electronic, and transport properties of spintronic materials. Achievable εL in thin film samples induced by traditional ferroelectric or flexible substrates is usually volatile and well below 1%. Such limits in the tuning capability cannot meet the requirements for nonvolatile applications of spintronic materials. This study answers to the challenge of introducing significant amount of elastic strain in deposited thin films so that noticeable tuning of the spintronic characteristics can be realized. Based on subtle elastic strain engineering of depositing L10-FePt films on pre-stretched NiTi(Nb) shape memory alloy substrates, steerable and nonvolatile lattice strain up to 2.18% has been achieved in the L10-FePt films by thermally controlling the shape memory effect of the substrates. Introduced strains at this level significantly modify the electronic density of state, orbital overlap, and spin-orbit coupling (SOC) strength in the FePt film, leading to nonvolatile modulation of magnetic anisotropy and magnetization reversal characteristics. This finding not only opens an efficient avenue for the nonvolatile tuning of SOC based magnetism and spintronic effects, but also helps to clarify the physical nature of pure strain effect.
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12
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Wang J, Mi W, Wang L, Zhang Q, Peng D. Enhanced anomalous Hall effect in Fe nanocluster assembled thin films. Phys Chem Chem Phys 2014; 16:16623-8. [PMID: 24993747 DOI: 10.1039/c4cp01493f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enhanced anomalous Hall effect is observed in heterogeneous uniform Fe cluster assembled films with different film thicknesses (ta = 160-1200 nm) fabricated by a plasma-gas-condensation method. The anomalous Hall coefficient (Rs) at ta = 1200 nm reaches its maximum of 2.4 × 10(-8) Ω cm G(-1) at 300 K, which is almost four orders of magnitude larger than bulk Fe. The saturated Hall resistivity (ρ(A)xy) first increases and then decreases with the increase of temperature accompanied by a sign change from positive to negative. Analysis of the results revealed that ρ(A)xy decreases with increasing longitudinal resistivity (ρxx) on a double-logarithmic scale and obeys a new scaling relation of log(ρ(A)xy/ρxx) = a0 + b0 log ρxx.
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Affiliation(s)
- Junbao Wang
- Department of Materials Science and Engineering, College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, P. R. China.
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13
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Itabashi A, Ohtake M, Kirino F, Futamoto M. Fe 50Pt 50–xPd xalloy thin films with L1 0structure epitaxially grown on MgO(001) substrates. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20147506012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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He P, Ma X, Zhang JW, Zhao HB, Lüpke G, Shi Z, Zhou SM. Quadratic scaling of intrinsic Gilbert damping with spin-orbital coupling in L10 FePdPt films: experiments and Ab initio calculations. PHYSICAL REVIEW LETTERS 2013; 110:077203. [PMID: 25166400 DOI: 10.1103/physrevlett.110.077203] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 12/10/2012] [Indexed: 06/03/2023]
Abstract
The dependence of the intrinsic Gilbert damping parameter α(0) on the spin-orbital coupling strength ξ is investigated in L1(0) ordered FePd(1-x) Pt(x) films by time-resolved magneto-optical Kerr effect measurements and spin-dependent ab initio calculations. Continuous tuning of α(0) over more than one order of magnitude is realized by changing the Pt/Pd concentration ratio showing that α(0) is proportional to ξ(2) as changes of other leading parameters are found to be negligible. The perpendicular magnetic anisotropy is shown to have a similar variation trend with x. The present results may facilitate the design and fabrication of new magnetic alloys with large perpendicular magnetic anisotropy and tailored damping properties.
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Affiliation(s)
- P He
- Surface Physics State Laboratory and Department of Physics, Fudan University, Shanghai 200433, China and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - X Ma
- Department of Applied Science, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - J W Zhang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - H B Zhao
- Department of Applied Science, College of William and Mary, Williamsburg, Virginia 23185, USA and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
| | - G Lüpke
- Department of Applied Science, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - Z Shi
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - S M Zhou
- Surface Physics State Laboratory and Department of Physics, Fudan University, Shanghai 200433, China and Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
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