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Tilted spin current generated by the collinear antiferromagnet ruthenium dioxide
Nature Electronics ( IF 34.3 ) Pub Date : 2022-05-05 , DOI: 10.1038/s41928-022-00744-8
Arnab Bose , Nathaniel J. Schreiber , Rakshit Jain , Ding-Fu Shao , Hari P. Nair , Jiaxin Sun , Xiyue S. Zhang , David A. Muller , Evgeny Y. Tsymbal , Darrell G. Schlom , Daniel C. Ralph

Symmetry plays a central role in determining the polarization of spin currents induced by electric fields. It also influences how these spin currents generate spin-transfer torques in magnetic devices. Here we show that an out-of-plane damping-like torque can be generated in ruthenium dioxide (RuO2)/permalloy devices when the Néel vector of the collinear antiferromagnet RuO2 is canted relative to the sample plane. By measuring characteristic changes in all three components of the electric-field-induced torque vector as a function of the angle of the electric field relative to the crystal axes, we find that the RuO2 generates a spin current with a well-defined tilted spin orientation that is approximately parallel to the Néel vector. A maximum out-of-plane damping-like spin torque efficiency per unit electric field of 7 ± 1 × 103 Ω−1 m−1 is measured at room temperature. The observed angular dependence indicates that this is an antiferromagnetic spin Hall effect with symmetries that are distinct from other mechanisms of spin-current generation reported in antiferromagnetic and ferromagnetic materials.



中文翻译:

共线反铁磁体二氧化钌产生的倾斜自旋电流

对称性在确定由电场引起的自旋电流的极化方面起着核心作用。它还影响这些自旋电流如何在磁性器件中产生自旋转移力矩。在这里,我们展示了当共线反铁磁体 RuO 2的 Néel 矢量相对于样品平面倾斜时,二氧化钌 (RuO 2 )/坡莫合金器件中会产生平面外阻尼类扭矩。通过测量电场感应扭矩矢量的所有三个分量的特性变化作为电场相对于晶轴的角度的函数,我们发现 RuO 2生成具有明确定义的倾斜自旋方向的自旋电流,该方向大致平行于 Néel 矢量。在室温下测量7±1×10 3  Ω -1  m -1的每单位电场的最大平面外阻尼自旋扭矩效率。观察到的角度依赖性表明这是一种反铁磁自旋霍尔效应,其对称性不同于反铁磁和铁磁材料中报道的其他自旋电流产生机制。

更新日期:2022-05-06
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