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arXiv 1908.09863cond-mat.mtrl-sci
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Ta/TbFeCo反常霍尔效应的异常场依赖性

Unusual Field Dependence of Anomalous Hall Effect in Ta/TbFeCo

M. D. Davydova, Jong-Ching Wu, Sheng-Zhe Ciou, Yi-Ru Chiou, P. N. Skirdkov, K. A. Zvezdin, A. V. Kimel, Lin-Xiu Ye, Te-Ho Wu, Ramesh Chandra Bhatt, A. K. Zvezdin

摘要:

本文对Ta/TbFeCo薄膜在3 T以下的温度和磁场范围内的反常霍尔效应进行了实验研究。虽然远离补偿温度(TM=277 K)的场依赖性具有单个磁滞回线的常规形状,但在补偿点以下,场依赖性是异常的,具有三重磁滞的形状。为了理解这种行为,我们实验上揭示了磁相图和理论上分析它的自旋重取向相变。我们发现,人们应该期待的异常磁滞回线低于补偿点,如果在它附近的磁各向异性占主导地位的FeCo亚晶格由于与Ta的相互作用。

英文摘要:

Experimental studies of anomalous Hall effect are performed for thin filmed Ta/TbFeCo in a wide range of temperatures and magnetic fields up to 3 T. While far from the compensation temperature (TM=277 K) the field dependence has a conventional shape of a single hysteresis loop, just below the compensation point the dependence is anomalous having the shape of a triple hysteresis. To understand this behavior, we experimentally reveal the magnetic phase diagram and theoretically analyze it in terms of spin-reorientation phase transitions. We show that one should expect anomalous hysteresis loops below the compensation point if in the vicinity of it the magnetic anisotropy is dominated by FeCo sublattice due to interaction with Ta.

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