铁磁性
凝聚态物理
材料科学
双层
霍尔效应
自旋霍尔效应
无定形固体
自旋(空气动力学)
自旋极化
化学
结晶学
电阻率和电导率
物理
热力学
生物化学
量子力学
膜
电子
作者
N. Pham,Kyung-Hun Ko,Gyung‐Min Choi
摘要
Spin Hall effect (SHE) in heavy metals generates a spin–orbit torque (SOT) on a ferromagnet. Research has been focused on the material properties of heavy metals to enhance SOT efficiency, and promising alloys for large SHE have been reported. In this study, we optically investigated the SOT of a PtMn alloy with Mn concentrations ranging from 0 to 75%. We observed that the critical Mn concentration for the maximum SOT depends on the ferromagnet: with Co as a ferromagnet, a peak spin Hall angle of 0.11 was obtained at an Mn concentration of 25%; with CoFeB as a ferromagnet, a peak spin Hall angle of 0.18 was obtained at an Mn concentration of 50%. Such a strong ferromagnetic dependence may originate from the structural matching between the poorly crystalline structure of PtMn and amorphous structure of CoFeB.
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