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Anisotropic magnetoresistance across Verwey transition in charge ordered Fe_3O_4 epitaxial films

机译：电荷有序Fe_3O_4外延膜中沿Verwey跃迁的各向异性磁阻

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摘要

The anisotropic magnetoresistance (AMR) near the Verwey temperature (7V) is investigated in charge ordered Fe_3O_4 epitaxial films. When the temperature continuously decreases below 7V, the symmetry of AMR in Fe_3O_4(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 Fe_3O_4(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 Fe_3O_4(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.
机译：在电荷有序的Fe_3O_4外延膜中研究了Verwey温度（7V）附近的各向异性磁阻（AMR）。当温度连续降低到7V以下时，Fe_3O_4（100）膜中的AMR对称性在磁场平行于膜表面的50 kOe磁场下从两倍发展到四倍，而Fe_3O_4（111）膜中的AMR对称保持双重对称。通过分析低于T_v的AMR，发现Verwey跃迁包含两个步骤，包括快速电荷有序过程和三聚体的连续形成过程，这取决于温度相关的拉曼光谱。在T_v之下，Fe_3O_4（100）薄膜中的双重AMR源自单轴磁各向异性。较低温度下的四倍AMR可以归因于平面三聚体。通过比较两个方向的薄膜中的AMR，发现三聚体在平行磁场中显示出较小的电阻率。与场有关的AMR结果表明，对三聚体敏感的场的最小阈值约为2 kOe。

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  • 来源
    《Physical review》 |2017年第21期|214434.1-214434.8|共8页
  • 作者

    Xiang Liu; Wenbo Mi; Qiang Zhang; Xixiang Zhang;

  • 作者单位

    Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China;

    Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China;

    PSE Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia;

    PSE Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia;

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