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arXiv 1602.00670cond-mat.mtrl-sci
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单晶反铁磁Ir-Mn /铁磁坡莫合金双层膜中与面相关的巨自旋轨道矩

Facet-dependent giant spin orbit torque in single crystalline antiferromagnetic Ir-Mn / ferromagnetic permalloy bilayers

Weifeng Zhang, Wei Han, See-hun Yang, Yan Sun, Yang Zhang, Binghai Yan, Stuart S. P. Parkin

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21 pages, 6 figures, 1 Table
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摘要：

自旋轨道转矩的目的是操纵的铁磁（FM）薄膜或纳米元件的自旋电子技术的磁化已经有相当大的兴趣。自旋-轨道扭矩源自自旋电流，该自旋电流由扩散到相邻FM材料中的具有显著自旋-轨道耦合的材料中的电荷电流产生。已经进行了大量的努力来寻找表现出大的自旋霍尔角，即有效的电荷到自旋电流转换的候选材料。在这里，我们报告，使用自旋扭矩铁磁共振，观察到一个巨大的自旋霍尔角高达~0.35（100）取向的单晶反铁磁（AF）IrMn 3薄膜，耦合到铁磁坡莫合金层，和一个自旋霍尔角，约三倍小（111）取向的薄膜。对于（100）取向的样品，我们表明，自旋霍尔角的大小可以显着改变通过操纵的人口的各种AF域通过场退火。使用从头计算，我们表明，IrMn 3的三角形AF结构产生了实质性的固有自旋霍尔电导率，其（100）比（111）取向大三倍，与我们的实验结果一致。

英文摘要：

There has been considerable interest in spin-orbit torques for the purpose of manipulating the magnetization of ferromagnetic (FM) films or nano-elements for spintronic technologies. Spin-orbit torques are derived from spin currents created from charge currents in materials with significant spin-orbit coupling that diffuse into an adjacent FM material. There have been intensive efforts to search for candidate materials that exhibit large spin Hall angles, i.e. efficient charge to spin current conversion. Here we report, using spin torque ferromagnetic resonance, the observation of a giant spin Hall angle of up to ~0.35 in (100) oriented single crystalline antiferromagnetic (AF) IrMn3 thin films, coupled to ferromagnetic permalloy layers, and a spin Hall angle that is about three times smaller in (111) oriented films. For the (100) oriented samples we show that the magnitude of the spin Hall angle can be significantly changed by manipulating the populations of the various AF domains through field annealing. Using ab-initio calculations we show that the triangular AF structure of IrMn3 gives rise to a substantial intrinsic spin Hall conductivity that is three times larger for the (100) than for the (111) orientations, consistent with our experimental findings.

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