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Self-assembly of ferria – nanocellulose composite fibres. Carbohydr Polym 2022; 291:119560. [DOI: 10.1016/j.carbpol.2022.119560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/12/2022] [Accepted: 04/28/2022] [Indexed: 11/25/2022]
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Magnetic order and disorder environments in superantiferromagnetic [Formula: see text] nanoparticles. Sci Rep 2022; 12:9733. [PMID: 35697857 PMCID: PMC9192703 DOI: 10.1038/s41598-022-13817-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 05/27/2022] [Indexed: 11/08/2022] Open
Abstract
Magnetic nanoparticles exhibit two different local symmetry environments, one ascribed to the core and one corresponding to the nanoparticle surface. This implies the existence of a dual spin dynamics, leading to the presence of two different magnetic arrangements governed by different correlation lengths. In this work, two ensembles of [Formula: see text] nanoparticles with mean sizes of 18 nm and 13 nm have been produced to unravel the magnetic couplings established among the magnetic moments located within the core and at the nanoparticle surface. To this end, we have combined neutron diffraction measurements, appropriate to investigate magnetically-ordered spin arrangements, with time-dependent macroscopic AC susceptibility measurements to reveal memory and aging effects. The observation of the latter phenomena are indicative of magnetically-frustrated states. The obtained results indicate that, while the [Formula: see text] magnetic moments located within the nanoparticle core keep the bulk antiferromagnetic commensurate structure in the whole magnetic state, the correlations among the surface spins give rise to a collective frustrated spin-glass phase. The interpretation of the magnetic structure of the nanoparticles is complemented by specific-heat measurements, which further support the lack of incommensurability in the nanoparticle state.
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Coordination of rare earth element cations on the surface of silica-derived nanoadsorbents. Dalton Trans 2018; 47:1312-1320. [DOI: 10.1039/c7dt04388k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coordination of REE cations adsorbed on the surface of non-functionalized and complexone-functionalized silica particles was revealed by EXAFS spectroscopy and magnetic studies using X-ray single crystal models as a reference.
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Size and property bimodality in magnetic nanoparticle dispersions: single domain particles vs. strongly coupled nanoclusters. NANOSCALE 2017; 9:4227-4235. [PMID: 28290585 DOI: 10.1039/c7nr00023e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The widespread use of magnetic nanoparticles in the biotechnical sector puts new demands on fast and quantitative characterization techniques for nanoparticle dispersions. In this work, we report the use of asymmetric flow field-flow fractionation (AF4) and ferromagnetic resonance (FMR) to study the properties of a commercial magnetic nanoparticle dispersion. We demonstrate the effectiveness of both techniques when subjected to a dispersion with a bimodal size/magnetic property distribution: i.e., a small superparamagnetic fraction, and a larger blocked fraction of strongly coupled colloidal nanoclusters. We show that the oriented attachment of primary nanocrystals into colloidal nanoclusters drastically alters their static, dynamic, and magnetic resonance properties. Finally, we show how the FMR spectra are influenced by dynamical effects; agglomeration of the superparamagnetic fraction leads to reversible line-broadening; rotational alignment of the suspended nanoclusters results in shape-dependent resonance shifts. The AF4 and FMR measurements described herein are fast and simple, and therefore suitable for quality control procedures in commercial production of magnetic nanoparticles.
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New product from old reaction: uniform magnetite nanoparticles from iron-mediated synthesis of alkali iodides and their protection from leaching in acidic media. RSC Adv 2014. [DOI: 10.1039/c4ra02217c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Magnetic material stable to acid leaching was produced by silica coating of byproduct from the industrial synthesis of alkali iodides.
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Synthesis and characterization of perovskite-type SrxY1−xFeO3−δ (0.63≤x<1.0) and Sr0.75Y0.25Fe1−yMyO3−δ (M=Cr, Mn, Ni), (y=0.2, 0.33, 0.5). J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Microscopic mechanisms influencing the volume amplified magnetic nanobead detection assay. Biosens Bioelectron 2008; 24:696-703. [DOI: 10.1016/j.bios.2008.06.043] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/19/2008] [Accepted: 06/23/2008] [Indexed: 01/08/2023]
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10
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Low-field susceptibility of classical Heisenberg chains with arbitrary and different nearest-neighbour exchange. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:204119. [PMID: 21694248 DOI: 10.1088/0953-8984/20/20/204119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Interest in molecular magnets continues to grow, offering a link between the atomic and nanoscale properties. The classical Heisenberg model has been effective in modelling exchange interactions in such systems. In this, the magnetization and susceptibility are calculated through the partition function, where the Hamiltonian contains both Zeeman and exchange energy. For an ensemble of N spins, this requires integrals in 2N dimensions. For two, three and four spin nearest-neighbour chains these integrals reduce to sums of known functions. For the case of the three and four spin chains, the sums are equivalent to results of Joyce. Expanding these sums, the effect of the exchange on the linear susceptibility appears as Langevin functions with exchange term arguments. These expressions are generalized here to describe an N spin nearest-neighbour chain, where the exchange between each pair of nearest neighbours is different and arbitrary. For a common exchange constant, this reduces to the result of Fisher. The high-temperature expansion of the Langevin functions for the different exchange constants leads to agreement with the appropriate high-temperature quantum formula of Schmidt et al, when the spin number is large. Simulations are presented for open linear chains of three, four and five spins with up to four different exchange constants, illustrating how the exchange constants can be retrieved successfully.
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11
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Comment on "Mn interstitial diffusion in (Ga,Mn) As". PHYSICAL REVIEW LETTERS 2005; 94:139701; author reply 139702. [PMID: 15904050 DOI: 10.1103/physrevlett.94.139701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2004] [Indexed: 05/02/2023]
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12
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On the sharpness of the interfaces in metallic multilayers. Proc Natl Acad Sci U S A 2004; 101:4742-5. [PMID: 15047888 PMCID: PMC387318 DOI: 10.1073/pnas.0305313101] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2003] [Indexed: 11/18/2022] Open
Abstract
We show that the three most relevant magnetic properties (magnetic moment, critical temperature, and interlayer exchange coupling) of metallic multilayers can be reproduced with good accuracy by first principles theory, provided that the picture of atomically sharp interfaces is abandoned and one allows instead for both interface alloying and interface roughness. The interface of a metallic multilayer (exemplified by the Fe/V system) is demonstrated to, at best, have interdiffusion essentially over two to three atomic layers on each side of the interface. Our conclusions are the result of combining experimental work with theoretical modeling, and we argue that this approach is the best avenue to obtain accurate information about the interface quality of metallic multilayers.
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Defect-induced magnetic structure in (Ga(1)-(x)Mn(x))As. PHYSICAL REVIEW LETTERS 2002; 88:187202. [PMID: 12005716 DOI: 10.1103/physrevlett.88.187202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2001] [Indexed: 05/23/2023]
Abstract
We show that magnetic structures involving partial disorder of local magnetic moments on the Mn atoms in (Ga(1)-(x)Mn(x))As lower the total energy, compared to the case of perfect ferromagnetic ordering, when As defects on the Ga sublattice are present. Such magnetic structures are found to be stable for a range of concentrations of As antisites, and this result accounts for the observed magnetic moments and critical temperatures in (Ga(1)-(x)Mn(x))As. We propose an explanation for the stabilization of the partially disordered magnetic structures and conclude that the magnetization and critical temperatures should increase substantially by reducing the number of As antisite defects.
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Large nonlinear dynamical response of superparamagnets: interplay between precession and thermoactivation in the stochastic landau-lifshitz equation. PHYSICAL REVIEW LETTERS 2000; 85:3724-3727. [PMID: 11030991 DOI: 10.1103/physrevlett.85.3724] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2000] [Indexed: 05/23/2023]
Abstract
The nonlinear dynamical response of classical spins governed by the stochastic Landau-Lifshitz equation is found to be large and very sensitive to the damping in the medium-to-weak damping regime. This result is interpreted in terms of a cooperation, induced by the driving field, between the precession of the spin and its thermoactivation over the potential barrier. The large damping dependence (absent in the linear response) can be used to determine the evasive damping coefficient in superparamagnets, so clarifying the nature of the spin-environment interaction in these systems.
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Time dependence of the magnetization of Bi2Sr2CaCu2O8 displaying the paramagnetic Meissner effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:7675-7681. [PMID: 9979712 DOI: 10.1103/physrevb.52.7675] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Time dependence of the paramagnetic Meissner effect: Comparison between model calculations and experiments. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12776-12781. [PMID: 9978054 DOI: 10.1103/physrevb.51.12776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Monte Carlo studies of Ising spin-glass systems: Investigations of the overlap length in spin glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:1120-1126. [PMID: 10010417 DOI: 10.1103/physrevb.49.1120] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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20
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New noise exponents in random conductor-superconductor and conductor-insulator mixtures. PHYSICAL REVIEW LETTERS 1993; 71:2817-2820. [PMID: 10054783 DOI: 10.1103/physrevlett.71.2817] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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21
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Time-dependent ac susceptibility in spin glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:13867-13873. [PMID: 10003450 DOI: 10.1103/physrevb.46.13867] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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22
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Magnetic behavior of a reentrant Ising spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:8227-8231. [PMID: 10002582 DOI: 10.1103/physrevb.46.8227] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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23
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Monte Carlo studies of Ising spin-glass systems: Aging behavior and crossover between equilibrium and nonequilibrium dynamics. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:8297-8304. [PMID: 10002591 DOI: 10.1103/physrevb.46.8297] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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24
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Static scaling in a short-range Ising spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:8199-8203. [PMID: 9996445 DOI: 10.1103/physrevb.43.8199] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Magnetic relaxation in an isotropic extreme type-II superconductor. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:2735-2741. [PMID: 9997569 DOI: 10.1103/physrevb.43.2735] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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26
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Raman spectra, superconductivity, and structure of Co-substituted YBa2Cu3O7- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:6787-6796. [PMID: 9991051 DOI: 10.1103/physrevb.40.6787] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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27
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Equilibrium magnetic fluctuations of a short-range Ising spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:7162-7166. [PMID: 9991102 DOI: 10.1103/physrevb.40.7162] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Observation of a time-dependent spatial correlation length in a metallic spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:7097-7100. [PMID: 9945410 DOI: 10.1103/physrevb.38.7097] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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30
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Dynamics of an Ising spin-glass in the vicinity of the spin-glass temperature. PHYSICAL REVIEW LETTERS 1988; 61:754-757. [PMID: 10039421 DOI: 10.1103/physrevlett.61.754] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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31
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Equilibrium magnetic fluctuations in a Ruderman-Kittel-Kasuya-Yosida spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 37:2383-2386. [PMID: 9944781 DOI: 10.1103/physrevb.37.2383] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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32
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Reply to "Comment on 'Time decay of the saturated remanent magnetization in a metallic spin glass' ". PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 37:579. [PMID: 9943623 DOI: 10.1103/physrevb.37.579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Comment on "Temperature dependence of the response time of dilute metallic spin glasses". PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:7181-7184. [PMID: 9940996 DOI: 10.1103/physrevb.35.7181] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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34
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Field quenching: A method to achieve a random initial state for aging experiments on spin glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:7150-7152. [PMID: 9940985 DOI: 10.1103/physrevb.35.7150] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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35
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Time decay of the saturated remanent magnetization in a metallic spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:2075-2078. [PMID: 9941648 DOI: 10.1103/physrevb.35.2075] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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36
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Relaxation in spin glasses at weak magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:268-273. [PMID: 9940595 DOI: 10.1103/physrevb.35.268] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Relaxation behavior of fractal-cluster spin glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 34:8164-8167. [PMID: 9939518 DOI: 10.1103/physrevb.34.8164] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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38
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Time decay of the remanent magnetization in a CuMn spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:645-648. [PMID: 9937967 DOI: 10.1103/physrevb.33.645] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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