Separating spin dynamics modes in iron oxide nanoparticles
Zobel M, Appel M, Thomä SL, Plekhanov M, Magerl A (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 111
Article Number: L060406
Journal Issue: 6
DOI: 10.1103/PhysRevB.111.L060406
Abstract
The different modes of the spin dynamics in ferrimagnetic magnetite iron oxide nanoparticles (Fe3O4) have been addressed by μeV neutron spectroscopy for particles with a diameter of 75 ± 18 Å. In an approach building on intensity considerations over a wide range of wave vectors Q in combination with diffusion dynamics, we identify three magnetic modes prevailing in distinct Q regimes up to 1.7 Å-1: (i) Evaluating the structure factor of quasielastic magnetic intensity enables to identify uniquely longitudinal superparamagnetic spin fluctuations in the small Q regime <0.5Å-1, (ii) individual spin relaxation with quasielastic intensity albeit of low intensity is present in two Q ranges of 0.5 Å-1 APA: Zobel, M., Appel, M., Thomä, S.L., Plekhanov, M., & Magerl, A. (2025). Separating spin dynamics modes in iron oxide nanoparticles. Physical Review B, 111(6). https://doi.org/10.1103/PhysRevB.111.L060406 MLA: Zobel, M., et al. "Separating spin dynamics modes in iron oxide nanoparticles." Physical Review B 111.6 (2025). BibTeX: DownloadInvolved external institutions
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
Institute Laue-Langevin (ILL)
France (FR)
Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology
Switzerland (CH)
Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen
Germany (DE)
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