Sign Reversal of Hall Conductivity in Polycrystalline FeRh Films via the Topological Hall Effect in the Antiferromagnetic Phase.

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Tác giả: Md Sabbir Akhanda, Steven Bennett, Jung-Min Cho, Jae Won Choi, Gil-Sung Kim, Yun-Ho Kim, Sang-Kwon Lee, Won-Yong Lee, Gangmin Park, No-Won Park, Bellave Shivaram, Mona Zebarjadi

Ngôn ngữ: eng

Ký hiệu phân loại: 700.4 Special topics in the arts

Thông tin xuất bản: United States : Nano letters , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 691810

The intrinsic Berry curvature in ferromagnetic (FM) materials significantly influences Hall conductivity during the antiferromagnetic (AFM)-to-FM phase transition, as demonstrated through the anomalous Hall effect (AHE). First-principles calculations indicate negligible spin Hall conductivity in FeRh materials in the AFM phase due to time-reversal symmetry breaking. To date, the contribution of the Berry curvature to the spin Hall effect remains unexamined in the context of AHE measurements. This study presents the temperature-dependent spin and carrier transport properties of FeRh thin films across AFM-to-FM transitions. In the AFM phase, a nonzero AHE signal is observed and even reverses its sign when the film transitions to the FM phase (above
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