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    Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

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    PhysRevB.96.214434.pdf
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    Type
    Article
    Authors
    Liu, Xiang
    Mi, Wenbo
    Zhang, Qiang cc
    Zhang, Xixiang cc
    KAUST Department
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Nanofabrication Core Lab
    Physical Science and Engineering (PSE) Division
    Thin Films & Characterization
    Date
    2017-12-26
    Permanent link to this record
    http://hdl.handle.net/10754/626746
    
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    Abstract
    The anisotropic magnetoresistance (AMR) near the Verwey temperature (T-V) is investigated in charge ordered Fe3O4 epitaxial films. When the temperature continuously decreases below T-V, the symmetry of AMR in Fe3O4(100) film evolves from twofold to fourfold at a magnetic field of 50 kOe, where the magnetic field is parallel to the film surface, whereas AMR in Fe3O4(111) film maintains twofold symmetry. By analyzing AMR below T-V, it is found that the Verwey transition contains two steps, including a fast charge ordering process and a continuous formation process of trimeron, which is comfirmed by the temperature-dependent Raman spectra. Just below T-V, the twofold AMR in Fe3O4(100) film originates from uniaxial magnetic anisotropy. The fourfold AMR at a lower temperature can be ascribed to the in-plane trimerons. By comparing the AMR in the films with two orientations, it is found that the trimeron shows a smaller resistivity in a parallel magnetic field. The field-dependent AMR results show that the trimeron-sensitive field has a minimum threshold of about 2 kOe.
    Citation
    Liu X, Mi W, Zhang Q, Zhang X (2017) Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films. Physical Review B 96. Available: http://dx.doi.org/10.1103/PhysRevB.96.214434.
    Sponsors
    This work is supported by the National Natural Science Foundation of China (Grants No. 51671142 and No. U1632152) and the Key Project of the Natural Science Foundation of Tianjin (Grant No. 16JCZDJC37300).
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.96.214434
    Additional Links
    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.214434
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.96.214434
    Scopus Count
    Collections
    Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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