Modulated switching current density and spin-orbit torques in MnGa/Ta films with inserting ferromagnetic layers.
Modulated switching current density and spin-orbit torques in MnGa/Ta films with inserting ferromagnetic layers.
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插入铁磁层的 MnGa/Ta 薄膜中的调制开关电流密度和自旋轨道扭矩
DOI：
10.1038/srep38375
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发表时间：
2016-12-02
影响因子：
4.6
通讯作者：
Jiang Y
中科院分区：
文献类型：
--
作者：
Meng K;Miao J;Xu X;Wu Y;Xiao J;Zhao J;Jiang Y
我们报告调制开关电流密度和自旋轨道扭矩（SOT）在MnGa/Ta薄膜插入非常薄的Co2 FeAl和Co层。在MnGa/Co2 FeAl/Ta中发现了铁磁耦合，导致有效各向异性场减小。相反，在MnGa/Co/Ta中，反铁磁耦合起主导作用。MnGa/Ta的开关电流密度为8.5 × 107 A/cm ~ 2。插入0.8nm厚的Co_2FeAl和Co后，Jc分别为5 × 107 A/cm ~ 2和9 × 107 A/cm ~ 2。通过进行绝热谐波霍尔电压测量，它表明，插入Co2 FeAl层主要增强类场转矩，而在MnGa/Co/Ta的阻尼类转矩已被增强。最后，利用自旋霍尔磁电阻测量研究了增强的自旋霍尔效应。调制的Jc和SOT归因于磁耦合，Rashba效应和SHE在界面处的组合。
We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co2FeAl and Co layers. Ferromagnetic coupling has been found in MnGa/Co2FeAl/Ta, resulting in a decreased effective anisotropy field. On the contrary, in MnGa/Co/Ta, antiferromagnetic coupling plays a dominant role. The switching current densityJcin MnGa/Ta is 8.5 × 107A/cm2. After inserting 0.8-nm-thick Co2FeAl and Co, theJcbecomes 5 × 107A/cm2and 9 × 107A/cm2, respectively. By performing adiabatic harmonic Hall voltage measurements, it is demonstrated that the inserted Co2FeAl layer has mainly enhanced the field-like torques, while in MnGa/Co/Ta the damping-like torques have been enhanced. Finally, the enhanced spin Hall effect (SHE) has also been studied using the spin Hall magnetoresistance measurement. The modulatedJcand SOT are ascribed to the combination of magnetic coupling, Rashba effect and SHE at the interfaces.
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影响因子：
38.3
作者：
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通讯作者：
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