Stack structure and temperature dependence of spin-orbit torques in heterostructures with antiferromagnetic PtMn
Stack structure and temperature dependence of spin-orbit torques in heterostructures with antiferromagnetic PtMn
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DOI：
10.1063/1.5129829
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发表时间：
2019-12
影响因子：
4
通讯作者：
Ryuichi Itoh;Y. Takeuchi;S. DuttaGupta;S. Fukami;H. Ohno
中科院分区：
文献类型：
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作者：
Ryuichi Itoh;Y. Takeuchi;S. DuttaGupta;S. Fukami;H. Ohno
利用扩展的谐波霍尔测量方法研究了金属反铁磁(AFM)/铁磁(FM)PtMn/CoFeb异质结中自旋轨道扭矩(SOT)的堆积结构和温度依赖性。结果表明，PtMn/CoFeb显示出相当大的SLonczewski样场状SoT，其大小与非磁性重金属如Pt或Ta的异质结相当。我们还发现，我们的PtMn/CoFeb结构中的SOT随温度变化几乎是恒定的。这些发现将为理解AFM/FM系统中SOTS的产生机制提供线索，并为非易失性存储器和神经形态计算的应用铺平道路。
We evaluate the stack structure and temperature dependence of the spin–orbit torques (SOTs) in metallic antiferromagnet (AFM)/ferromagnet (FM) PtMn/CoFeB heterostructures using an extended harmonic Hall measurement. We show that PtMn/CoFeB exhibits sizable Slonczewski-like and fieldlike SOTs whose magnitude is comparable to that of heterostructures with nonmagnetic heavy metals like Pt or Ta. We also find that the SOTs in our PtMn/CoFeB structures are virtually constant with temperature. The findings will offer clues to understand the generation mechanism of SOTs in AFM/FM systems and pave the way for nonvolatile memory and neuromorphic computing applications.