论文标题
抗铁磁异质结构中的单向自旋霍尔磁场
Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures
论文作者
论文摘要
在重金属 /铁磁铁（HM / FM）双层系统中，单向自旋大厅磁磁性（USMR）已广泛报道。我们在PT/α-FE2O3双层中观察到USMR，其中α-FE2O3是一种抗铁磁（AFM）绝缘子。系统的场和温度依赖测量结果证实了USMR的宏伟起源。 AFM-USMR的出现是由由于热随机场引起的旋转轨道扭矩的创造和an灭AFM镁的失衡而驱动的。然而，与其铁磁对应物不同，理论建模表明，PT/α-FE2O3中的USMR由抗铁磁磁氧化镁数和非单调场依赖性确定。我们的发现扩展了USMR的一般性，这为AF旋转状态的高度敏感检测铺平了道路。
Unidirectional spin Hall magnetoresistance (USMR) has been widely reported in the heavy metal / ferromagnet (HM/FM) bilayer systems. We observe the USMR in the Pt/α-Fe2O3 bilayers where the α-Fe2O3 is an antiferromagnetic (AFM) insulator. Systematic field and temperature dependent measurements confirm the magnonic origin of the USMR. The appearance of AFM-USMR is driven by the imbalance of creation and annihilation of AFM magnons by spin orbit torque due to thermal random field. However, unlike its ferromagnetic counterpart, theoretical modeling reveals that the USMR in Pt/α-Fe2O3 is determined by the antiferromagtic magnon number, and with a non-monotonic field dependence. Our findings extend the generality of the USMR which pave the ways for the highly sensitive detection of AF spin state.
