Rashba spin-orbit anisotropy and the electric field control of magnetism.
Rashba spin-orbit anisotropy and the electric field control of magnetism.
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DOI：
10.1038/srep04105
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发表时间：
2014-02-17
影响因子：
4.6
通讯作者：
Maekawa S
中科院分区：
文献类型：
--
作者：
Barnes SE;Ieda J;Maekawa S
利用电场而不是电流来控制超薄铁磁层的磁性具有许多潜在的技术重要应用。人们通常坚持认为，这种控制发生通过电场诱导的表面电荷掺杂，修改磁各向异性。然而，在这种情况下，仍然无法理解一些关键实验。研究较多的是非磁性金属或半导体的传导电子由于Rashba自旋轨道耦合而产生的自旋劈裂。这反映了大的表面电场。对于磁体，通过Dzyaloshinskiii-Moriya机制，这种相同的分裂被交换场修改，导致大的磁各向异性能量。这种不同的，但传统的，路径的电致各向异性能量可以解释电场，厚度和材料的依赖性在许多实验中报告。
The control of the magnetism of ultra-thin ferromagnetic layers using an electric field, rather than a current, has many potential technologically important applications. It is usually insisted that such control occurs via an electric field induced surface charge doping that modifies the magnetic anisotropy. However, it remains the case that a number of key experiments cannot be understood within such a scenario. Much studied is the spin-splitting of the conduction electrons of non-magnetic metals or semi-conductors due to the Rashba spin-orbit coupling. This reflects a large surface electric field. For a magnet, this same splitting is modified by the exchange field resulting in a large magnetic anisotropy energy via the Dzyaloshinskii-Moriya mechanism. This different, yet traditional, path to an electrically induced anisotropy energy can explain the electric field, thickness, and material dependence reported in many experiments.