Anisotropic magnetoresistance across Verwey transition in charge ordered Fe                         3                         O                         4                          epitaxial films

Xiang Liu; Wenbo Mi; Qiang Zhang; Xixiang Zhang

doi:10.1103/PhysRevB.96.214434

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe ₃ O ₄ epitaxial films

Xiang Liu, Wenbo Mi, Qiang Zhang, Xixiang Zhang

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Research output: Contribution to journal › Article › peer-review

Abstract

The anisotropic magnetoresistance (AMR) near the Verwey temperature (TV) is investigated in charge ordered Fe ₃ O ₄ epitaxial films. When the temperature continuously decreases below TV, the symmetry of AMR in Fe ₃ O 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 ₃ O ₄ (111) film maintains twofold symmetry. By analyzing AMR below TV, 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 TV, the twofold AMR in Fe ₃ O 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.

Original language	English (US)
Article number	214434
Journal	Physical Review B
Volume	96
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.96.214434
State	Published - Dec 26 2017

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.96.214434

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Liu, X., Mi, W., Zhang, Q., & Zhang, X. (2017). Anisotropic magnetoresistance across Verwey transition in charge ordered Fe ₃ O ₄ epitaxial films Physical Review B, 96(21), Article 214434. https://doi.org/10.1103/PhysRevB.96.214434

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe ₃ O ₄ epitaxial films . / Liu, Xiang; Mi, Wenbo; Zhang, Qiang et al.
In: Physical Review B, Vol. 96, No. 21, 214434, 26.12.2017.

Research output: Contribution to journal › Article › peer-review

Liu, X, Mi, W, Zhang, Q & Zhang, X 2017, ' Anisotropic magnetoresistance across Verwey transition in charge ordered Fe ₃ O ₄ epitaxial films ', Physical Review B, vol. 96, no. 21, 214434. https://doi.org/10.1103/PhysRevB.96.214434

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title = " Anisotropic magnetoresistance across Verwey transition in charge ordered Fe 3 O 4 epitaxial films ",

abstract = " The anisotropic magnetoresistance (AMR) near the Verwey temperature (TV) is investigated in charge ordered Fe 3 O 4 epitaxial films. When the temperature continuously decreases below TV, the symmetry of AMR in Fe 3 O 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 3 O 4 (111) film maintains twofold symmetry. By analyzing AMR below TV, 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 TV, the twofold AMR in Fe 3 O 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.",

author = "Xiang Liu and Wenbo Mi and Qiang Zhang and Xixiang Zhang",

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AB - The anisotropic magnetoresistance (AMR) near the Verwey temperature (TV) is investigated in charge ordered Fe 3 O 4 epitaxial films. When the temperature continuously decreases below TV, the symmetry of AMR in Fe 3 O 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 3 O 4 (111) film maintains twofold symmetry. By analyzing AMR below TV, 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 TV, the twofold AMR in Fe 3 O 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.

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Anisotropic magnetoresistance across Verwey transition in charge ordered Fe ₃ O ₄ epitaxial films

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