1
|
Scherbakov A, Linnik T, Kukhtaruk S, Yakovlev D, Nadzeyka A, Rushforth A, Akimov A, Bayer M. Ultrafast magnetoacoustics in Galfenol nanostructures. PHOTOACOUSTICS 2023; 34:100565. [PMID: 38058748 PMCID: PMC10696383 DOI: 10.1016/j.pacs.2023.100565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 12/08/2023]
Abstract
Phonons and magnons are prospective information carriers to substitute the transfer of charge in nanoscale communication devices. Our ability to manipulate them at the nanoscale and with ultimate speed is examined by ultrafast acoustics and femtosecond optomagnetism, which use ultrashort laser pulses for generation and detection of the corresponding coherent excitations. Ultrafast magnetoacoustics merges these research directions and focuses on the interaction of optically generated coherent phonons and magnons. In this review, we present ultrafast magnetoacoustic experiments with nanostructures based on the alloy (Fe,Ga) known as Galfenol. We demonstrate how broad we can manipulate the magnetic response on an optical excitation by controlling the spectrum of generated coherent phonons and their interaction with magnons. Resonant phonon pumping of magnons, formation of magnon polarons, driving of a magnetization wave by a guided phonon wavepacket are demonstrated. The presented experimental results have great application potential in emerging areas of modern nanoelectronics.
Collapse
Affiliation(s)
- A.V. Scherbakov
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - T.L. Linnik
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
- Department of Theoretical Physics, V.E. Lashkaryov Institute of Semiconductor Physics, 03028 Kyiv, Ukraine
| | - S.M. Kukhtaruk
- Department of Theoretical Physics, V.E. Lashkaryov Institute of Semiconductor Physics, 03028 Kyiv, Ukraine
| | - D.R. Yakovlev
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
| | | | - A.W. Rushforth
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - A.V. Akimov
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - M. Bayer
- Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany
| |
Collapse
|
2
|
Ly O. Noncollinear antiferromagnetic textures driven high-harmonic generation from magnetic dynamics in the absence of spin-orbit coupling. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:125802. [PMID: 36669207 DOI: 10.1088/1361-648x/acb523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 01/20/2023] [Indexed: 06/17/2023]
Abstract
We demonstrate the generation of high order harmonics in carrier pumping from precessing ferromagnetic or antiferromagnetic orders, excited via magnetic resonance, in the presence of topological antiferromagnetic textures. This results in an enhancement of the carrier dynamics by orders of magnitude, enabling for an emission deep in the THz frequency range. Interestingly, the generation process occurs in an intrinsic manner, and is solely governed by the interplay between the s-d exchange coupling underlying the noncollinear antiferromagnetic order and the dynamical s-d exchange constant of the magnetic drive. Therefore, the relativistic spin-orbit interaction is not required for the emergence of high harmonics in the pumped currents. Accordingly, the noncollinear topological antiferromagnetic order is presented as an alternative to spin-orbit interaction for the purpose of harnessing high harmonic emission in carrier pumping. Furthermore, we demonstrate the emergence of high harmonics from random magnetic impurities. This suggests the universality of the magnetically induced high harmonic emission in the presence of real and/or momentum space noncollinear textures. Our proposal initiates a tantalizing prospect for the utilization of topological textures in the context of the highly active domains of ultrafast spintronics and THz emission.
Collapse
Affiliation(s)
- Ousmane Ly
- Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| |
Collapse
|
3
|
Soumah L, Bossini D, Anane A, Bonetti S. Optical Frequency Up-Conversion of the Ferromagnetic Resonance in an Ultrathin Garnet Mediated by Magnetoelastic Coupling. PHYSICAL REVIEW LETTERS 2021; 127:077203. [PMID: 34459643 DOI: 10.1103/physrevlett.127.077203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 06/07/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material's band gap, we trigger ultrafast optical and spin dynamics via both one- and two-photon absorption. Contrary to the common scenario, the optically induced excitation induces an increase up to 20% of the ferromagnetic resonance frequency of the material. We explain this unexpected result in terms of a modification of the magnetic anisotropy caused by a long-lived photo-induced strain, which transiently and reversibly modifies the magnetoelastic coupling in the material. Our results disclose the possibility to optically increase the magnetic eigenfrequency in nanometer-thick magnets.
Collapse
Affiliation(s)
- Lucile Soumah
- Department of Physics, Stockholm University, 10691 Stockholm, Sweden
| | - Davide Bossini
- Department of Physics and Center for Applied Photonics, University of Konstanz, 78464 Konstanz, Germany
| | - Abdelmadjid Anane
- Unit Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France
| | - Stefano Bonetti
- Department of Physics, Stockholm University, 10691 Stockholm, Sweden
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venice, Italy
| |
Collapse
|
4
|
Chernov AI, Kozhaev MA, Ignatyeva DO, Beginin EN, Sadovnikov AV, Voronov AA, Karki D, Levy M, Belotelov VI. All-Dielectric Nanophotonics Enables Tunable Excitation of the Exchange Spin Waves. NANO LETTERS 2020; 20:5259-5266. [PMID: 32515967 DOI: 10.1021/acs.nanolett.0c01528] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Launching and controlling magnons with laser pulses opens up new routes for applications including optomagnetic switching and all-optical spin wave emission and enables new approaches for information processing with ultralow energy dissipation. However, subwavelength light localization within the magnetic structures leading to efficient magnon excitation that does not inherently absorb light has still been missing. Here, we propose to marriage the laser-induced ultrafast magnetism and nanophotonics to efficiently excite and control spin dynamics in magnetic dielectric structures. We demonstrate that nanopatterning by a 1D grating of trenches allows localization of light in spots with sizes of tens of nanometers and thus launch the exchange standing spin waves of different orders. The relative amplitude of the exchange and magnetostatic spin waves can be adjusted on demand by modifying laser pulse polarization, incidence angle, and wavelength. Nanostructuring of the magnetic media provides a unique possibility for the selective spin manipulation, a key issue for further progress of magnonics, spintronics, and quantum technologies.
Collapse
Affiliation(s)
- Alexander I Chernov
- Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, Moscow 121353, Russia
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, National Research University, 9 Institutskiy per., Dolgoprudny 141700, Russia
- Vernadsky Crimean Federal University, 4 Vernadskogo Prospekt, Simferopol 295007, Russia
| | - Mikhail A Kozhaev
- Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, Moscow 121353, Russia
- Vernadsky Crimean Federal University, 4 Vernadskogo Prospekt, Simferopol 295007, Russia
- Prokhorov General Physics Institute RAS, 38 Vavilov Street, Moscow 119991, Russia
| | - Daria O Ignatyeva
- Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, Moscow 121353, Russia
- Vernadsky Crimean Federal University, 4 Vernadskogo Prospekt, Simferopol 295007, Russia
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Evgeniy N Beginin
- Saratov State University, 83 Astrakhanskaya Street, Saratov 410012, Russia
| | | | - Andrey A Voronov
- Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, Moscow 121353, Russia
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Dolendra Karki
- Physics Department, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931-1295, United States
| | - Miguel Levy
- Physics Department, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931-1295, United States
| | - Vladimir I Belotelov
- Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, Moscow 121353, Russia
- Vernadsky Crimean Federal University, 4 Vernadskogo Prospekt, Simferopol 295007, Russia
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| |
Collapse
|