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  Large magnetoresistance effects in Fe3O4

Liu, X. H., Chang, C. F., Tjeng, L. H., Komarek, A. C., & Wirth, S. (2019). Large magnetoresistance effects in Fe3O4. Journal of Physics: Condensed Matter, 31(22): 225803, pp. 1-7. doi:10.1088/1361-648X/ab0cf4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-6396-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-6398-2
Genre: Journal Article

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 Creators:
Liu, X. H.1, Author              
Chang, C. F.2, Author              
Tjeng, L. H.3, Author              
Komarek, A. C.4, Author              
Wirth, S.5, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863447              
3Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
4Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              
5Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              

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 Abstract: We investigated the magnetoresistance (MR) of a single crystal of magnetite, Fe3O4. In an effort to distinguish between different contributions to the MR the samples were prepared in two different initial magnetic states, i.e. by either zero-field or by field cooling from room temperature. The different magnetic structures in this sample have a dramatic effect on the magnetoresistance: for initially zero-field-cooled conditions a negative MR of about -20% is observed just below the Verwey transition at T-V approximate to 124 K. For decreasing temperature the MR increases, changes sign at similar to 78 K and reaches a record positive value of similar to 45% at around 50 K. This behavior is completely absent in the field-cooled sample. Magnetization measurements corroborate an alignment of the easy magnetization direction in applied magnetic fields below T-V as a cause of the strong effects observed in both, magnetization and MR. Our results point to a complex interplay of structural and magnetocrystalline effects taking place upon cooling Fe3O4 through T-V.

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Language(s): eng - English
 Dates: 2019-03-262019-03-26
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: ISI: 000462607200001
DOI: 10.1088/1361-648X/ab0cf4
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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys. Condens. Matter.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 31 (22) Sequence Number: 225803 Start / End Page: 1 - 7 Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478