Adiabatic and nonadiabatic spin torques induced by a spin-triplet supercurrent
Adiabatic and nonadiabatic spin torques induced by a spin-triplet supercurrent
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自旋三重态超流引起的绝热和非绝热自旋扭矩
DOI：
10.1103/physrevb.96.121203
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发表时间：
2017
影响因子：
3.7
通讯作者：
and T. Yokoyama
中科院分区：
文献类型：
--
作者：
R. Takashima;S. Fujimoto;and T. Yokoyama
研究了具有超导邻近效应的磁体中自旋三重态超电流引起的自旋转移力矩。通过微扰方法，我们证明了自旋三重态关联在没有非本征自旋翻转散射的情况下，实现了类似于绝热和非绝热（）力矩的新型力矩.与传统的自旋转移力矩相比，磁畴壁操纵突出了显着的优势。对于小的吉尔伯特阻尼，畴壁的振荡运动不会发生，并且驱动其运动的阈值电流密度在不存在非本征钉扎电位的情况下变为零，这是由于三重态相关性控制的非绝热扭矩。
We study spin-transfer torques induced by a spin-triplet supercurrent in a magnet with the superconducting proximity effect. By a perturbative approach, we show that spin-triplet correlations realize new types of torques, which are analogous to the adiabatic and nonadiabatic () torques, without extrinsic spin-flip scattering. Remarkable advantages compared to conventional spin-transfer torques are highlighted in domain-wall manipulation. Oscillatory motions of a domain wall do not occur for a small Gilbert damping, and the threshold current density to drive its motion becomes zero in the absence of extrinsic pinning potentials due to the nonadiabatic torque controlled by the triplet correlations.