Spontaneous anomalous and spin Hall effects due to spin-orbit scattering of evanescent wave functions in magnetic tunnel junctions.
Spontaneous anomalous and spin Hall effects due to spin-orbit scattering of evanescent wave functions in magnetic tunnel junctions.
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由于磁隧道结中倏逝波函数的自旋轨道散射而产生的自发反常和自旋霍尔效应。
DOI：
10.1103/physrevlett.110.247204
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发表时间：
2013
影响因子：
8.6
通讯作者：
B. Dieny
中科院分区：
文献类型：
--
作者：
A. Vedyayev;N. Ryzhanova;N. Strelkov;B. Dieny
我们从理论上研究了 F/I/F 形式的磁性隧道结中横向于绝缘垫片 I 的反常霍尔效应 (AHE) 和自旋霍尔效应 (SHE)，其中 F 是铁磁层，I 代表隧道势垒。我们考虑了纯弹道（量子力学）传输的情况。这些效应的产生是由于隧道势垒中的自旋轨道相互作用导致倏逝波函数的不对称散射。我们研究的 AHE 和 SHE 由于邻近效应而具有表面性质。它们的振幅在散射势中属于一阶。这与铁磁金属形成对比，其中这些效应在这些电势中是第二级（侧跳散射）和第三级（偏斜散射）。绝缘间隔件中的AHE电流值可能比金属铁磁电极中的AHE电流值大得多。由于两个 F 电极中磁化强度的反平行方向，即使在零施加电压下也存在自发霍尔电流。
We theoretically investigated the anomalous Hall effect (AHE) and spin Hall effect (SHE) transversal to the insulating spacer I, in magnetic tunnel junctions of the form F/I/F where the F's are ferromagnetic layers and I represents a tunnel barrier. We considered the case of purely ballistic (quantum mechanical) transport. These effects arise because of the asymmetric scattering of evanescent wave functions due to the spin-orbit interaction in the tunnel barrier. The AHE and SHE we investigated have a surface nature due to the proximity effect. Their amplitude is of first order in the scattering potential. This contrasts with ferromagnetic metals wherein these effects are of second (side-jump scattering) and third (skew scattering) order in these potentials. The value of the AHE current in the insulating spacer may be much larger than that in metallic ferromagnetic electrodes. For the antiparallel orientation of the magnetizations in the two F electrodes, a spontaneous Hall current exists even at zero applied voltage.