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arXiv 1603.08068cond-mat.mtrl-sci
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反铁磁体PtMn中的强自旋霍尔效应

Strong Spin Hall Effect in the Antiferromagnet PtMn

Yongxi Ou, Shengjie Shi, D. C. Ralph, R. A. Buhrman

摘要:

自从在某些重金属(HM)/铁磁(FM)体系中发现“巨”自旋霍尔效应(SHE)以来,利用面内电流有效地操纵FM薄膜纳米结构的磁性已经成为可能。近年来,理论和实验研究都表明,非共线和共线金属反铁磁材料可以同时具有较大的反常霍尔效应和较强的SHE。在这里,我们报告了一个系统的研究铂锰SHE与几个PtMn/FM系统。通过使用界面工程,以减少“自旋记忆损失”,我们得到的自旋力矩效率高达0.24。这是以前报道的PtMn自旋扭矩效率的两倍多。我们还发现PtMn中的表观自旋扩散长度非常长(约2.3nm)。

英文摘要:

Effectively manipulating magnetism in ferromagnet (FM) thin film nanostructures with an in-plane current has become feasible since the determination of a 'giant' spin Hall effect (SHE) in certain heavy metal (HM)/FM system. Recently, both theoretical and experimental reports indicate that the non-collinear and collinear metallic antiferromagnet (AF) materials can have both a large anomalous Hall effect (AHE) and a strong SHE. Here we report a systematic study of the SHE in PtMn with several PtMn/FM systems. By using interface engineering to reduce the 'spin memory loss' we obtain a spin torque efficiency as large as 0.24. This is more than twice the previously reported spin torque efficiency for PtMn. We also find that the apparent spin diffusion length in PtMn is surprisingly long (about 2.3nm).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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