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Possible evidence for a spin-state crossover in the Verwey state inFe3O4thin films

Yazdi, Mehrdad Baghaie and Major, Márton and Wildes, Andrew and Wilhelm, Fabrice and Rogalev, Andrei and Donner, Wolfgang and Alff, Lambert (2016):
Possible evidence for a spin-state crossover in the Verwey state inFe3O4thin films.
In: Physical Review B, APS Publishing, pp. 014439, 93, (1), ISSN 2469-9950, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.93.014439],
[Article]

Abstract

In epitaxial thin films of magnetite a large change in magnetization across the Verwey transition has been observed. In the Verwey state, the sample magnetization appeared to be strongly reduced, in some samples even close to zero. Using superconducting quantum interference magnetometry, x-ray absorption near edge spectroscopy, and polarized neutron reflectometry, a simple rotation of the magnetization vector due to a change in magnetocrystalline anisotropy was excluded. The experimental data rather suggest an intrinsic loss of magnetic moment due to a possible transition into a low or intermediate spin state of Fe2+. This observation discloses a different aspect of the Verwey transition.

Item Type: Article
Erschienen: 2016
Creators: Yazdi, Mehrdad Baghaie and Major, Márton and Wildes, Andrew and Wilhelm, Fabrice and Rogalev, Andrei and Donner, Wolfgang and Alff, Lambert
Title: Possible evidence for a spin-state crossover in the Verwey state inFe3O4thin films
Language: English
Abstract:

In epitaxial thin films of magnetite a large change in magnetization across the Verwey transition has been observed. In the Verwey state, the sample magnetization appeared to be strongly reduced, in some samples even close to zero. Using superconducting quantum interference magnetometry, x-ray absorption near edge spectroscopy, and polarized neutron reflectometry, a simple rotation of the magnetization vector due to a change in magnetocrystalline anisotropy was excluded. The experimental data rather suggest an intrinsic loss of magnetic moment due to a possible transition into a low or intermediate spin state of Fe2+. This observation discloses a different aspect of the Verwey transition.

Journal or Publication Title: Physical Review B
Volume: 93
Number: 1
Publisher: APS Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Apr 2016 11:18
Official URL: http://dx.doi.org/10.1103/PhysRevB.93.014439
Identification Number: doi:10.1103/PhysRevB.93.014439
Funders: The authors thank the LOEWE projects RESPONSE and AdRIA funded by the Hessen State Ministry of Higher Education, Research and the Arts (HMWK).
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