Orbital chirality and Rashba interaction in magnetic bands
Orbital chirality and Rashba interaction in magnetic bands
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DOI：
10.1103/physrevb.87.041301
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发表时间：
2013-01-03
影响因子：
3.7
通讯作者：
Han, Jung Hoon
中科院分区：
文献类型：
--
作者：
Park, Jin-Hong;Kim, Choong H.;Han, Jung Hoon
本文从理论上研究了磁性层与重金属层接触时的Rashba自旋轨道耦合现象。从第一性原理计算，一个大的Rashba参数的数量级为1 eV埃，这使得Rashba相互作用的一个强大的工具，提高自旋转移力矩。有趣的是，该参数的大小和符号随能带而变化，我们将其归因于轨道角动量的带特异性手性排序。我们认为，带的Rashba参数的依赖性提供了一个自然的解释主机最近的实验，并可能提高潜在的Rashba活性磁性层的设备应用。DOI：10.1103/PhysRevB.87.041301
The phenomenon of Rashba spin-orbit coupling is examined theoretically for an ultrathin magnetic layer in contact with a nonmagnetic heavy-metal layer. From a first-principles calculation, a large Rashba parameter of order 1 eV angstrom is obtained, which makes the Rashba interaction a powerful tool for enhancing the spin-transfer torque. Interestingly, the magnitude and sign of the parameter vary from energy band to energy band, which we attribute to band-specific chiral ordering of the orbital angular momentum. We argue that the band dependence of the Rashba parameter provides a natural explanation for a host of recent experiments and may enhance the potential for device application of the Rashba-active magnetic layer. DOI: 10.1103/PhysRevB.87.041301