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首页> 外文期刊>Physical review >Influence of the magnetic material on tunneling magnetoresistance and spin-transfer torque in tunnel junctions: Ab initio studies
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Influence of the magnetic material on tunneling magnetoresistance and spin-transfer torque in tunnel junctions: Ab initio studies

机译：磁性材料对隧道结中隧穿磁阻和自旋传递扭矩的影响：从头算

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摘要

The dependence of tunneling magnetoresistance and spin-transfer torque in FeCo/MgO/FeCo tunnel junctions on the Co concentration and the bias voltage are investigated ab initio. We find that the tunneling magnetoresistance decreases with the Co concentration, in contradiction to previous calculations but in agreement with recent experiments. This dependence is explained by the bulk properties of the alloys. By using a realistic description of the disorder in the alloys we show that even small amounts of disorder lead to a drastic drop in the tunneling magnetoresistance. This provides an explanation of the difference between calculated and measured values. The spin-transfer torque shows a linear voltage dependence for the in-plane component and a quadratic one for the out-of-plane component for all concentrations at low bias voltages. In particular, the linear slope of the in-plane torque is independent of the concentration. For high bias voltages the in-plane torque shows a strong nonlinear deviation from the linear slope for high Co concentrations. This is explained by the same effects which govern the tunneling magnetoresistance.
机译：从头开始研究了FeCo / MgO / FeCo隧道结中隧穿磁阻和自旋传递转矩对Co浓度和偏置电压的依赖性。我们发现隧穿磁阻随Co浓度的增加而降低，这与先前的计算相矛盾，但与最近的实验相符。这种依赖性由合金的整体性质来解释。通过对合金中无序的真实描述，我们表明，即使少量的无序也会导致隧穿磁阻的急剧下降。这提供了计算值和测量值之间差异的解释。对于低偏置电压下的所有浓度，自旋转移转矩显示出平面内分量的线性电压依赖性和平面外分量的二次电压依赖性。尤其是，面内转矩的线性斜率与浓度无关。对于高偏置电压，在高Co浓度下，面内转矩与线性斜率表现出很强的非线性偏差。这通过控制隧道磁阻的相同效应来解释。

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