Anomalous Hall effect and spin-orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of the antiferromagnet
Anomalous Hall effect and spin-orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of the antiferromagnet
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MnGa/IrMn 薄膜中的反常霍尔效应和自旋轨道扭矩：反铁磁体强自旋霍尔效应的修改
DOI：
10.1103/physrevb.94.214413
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发表时间：
2016-09
影响因子：
3.7
通讯作者：
孟康康
中科院分区：
文献类型：
--
作者：
孟康康
我们报告了 MnGa/IrMn 薄膜中反常霍尔效应 (AHE) 和自旋轨道扭矩 (SOT) 的系统测量，其中单个 $L{1}_{0}\text{\ensuremath{-}}\mathrm{MnGa}$ 外延层显示出明显的轨道双通道近藤 (2CK) 效应。随着反铁磁体IrMn厚度的增加，强自旋霍尔效应（SHE）逐渐抑制轨道2CK效应并改变MnGa的AHE。涉及多个竞争散射机制的缩放已被用来区分对修改后的 AHE 的不同贡献。最后，研究了由 IrMn 的强 SHE 引起的 MnGa/IrMn 薄膜中相当大的 SOT。 IrMn 层还提供面内交换偏置场，并实现几乎无场的磁化反转。
We report systematic measurements of anomalous Hall effect (AHE) and spin-orbit torques (SOTs) in MnGa/IrMn films, in which a single $L{1}_{0}\text{\ensuremath{-}}\mathrm{MnGa}$ epitaxial layer reveals obvious orbital two-channel Kondo (2CK) effect. As increasing the thickness of the antiferromagnet IrMn, the strong spin Hall effect (SHE) has gradually suppressed the orbital 2CK effect and modified the AHE of MnGa. A scaling involving multiple competing scattering mechanisms has been used to distinguish different contributions to the modified AHE. Finally, the sizeable SOT in the MnGa/IrMn films induced by the strong SHE of IrMn have been investigated. The IrMn layer also supplies an in-plane exchange bias field and enables nearly field-free magnetization reversal.