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  Evolution of magnetic properties in the vicinity of the Verwey transition in Fe3O4 thin films

Liu, X. H., Liu, W., & Zhang, Z. D. (2017). Evolution of magnetic properties in the vicinity of the Verwey transition in Fe3O4 thin films. Physical Review B, 96(9): 094405, pp. 1-13. doi:10.1103/PhysRevB.96.094405.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F590-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F594-5
Genre: Journal Article

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Liu, X. H.1, Author              
Liu, W.2, Author
Zhang, Z. D.2, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              

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 Abstract: We have systematically studied the evolution of magnetic properties, especially the coercivity and the remanence ratio in the vicinity of the Verwey transition temperature (TV), of high-quality epitaxial Fe3O4 thin films grown on MgO (001), MgAl2O4 (MAO) (001), and SrTiO3 (STO) (001) substrates. We observed rapid change of magnetization, coercivity, and remanence ratio at TV, which are consistent with the behaviors of resistivity versus temperature [rho(T)] curves for the different thin films. In particular, we found quite different magnetic behaviors for the thin films on MgO from those on MAO and STO, in which the domain size and the strain state play very important roles. The coercivity is mainly determined by the domain size but the demagnetization process is mainly dependent on the strain state. Furthermore, we observed a reversal of remanence ratio at TV with thickness for the thin films grown on MgO: from a rapid enhancement for 40-nm-to a sharp drop for 200-nm-thick film, and the critical thickness is about 80 nm. Finally, we found an obvious hysteretic loop of coercivity (or remanence ratio) with temperature around TV, corresponding to the hysteretic loop of the.(T) curve, in Fe3O4 thin film grown on MgO.

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Language(s): eng - English
 Dates: 2017-09-052017-09-05
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (9) Sequence Number: 094405 Start / End Page: 1 - 13 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008