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Thermally driven magnetic precession in spin valves

机译:旋转阀中的热驱动磁旋进

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摘要

We investigate the angular dependence of the spin torque generated when applying a temperature difference across a spin valve. Our study shows the presence of a nontrivial fixed point in this angular dependence. This fixed point opens the possibility for a temperature gradient to stabilize radio frequency oscillations without the need for an external magnetic field. This so-called "wavy" behavior can already be found upon applying a voltage difference across a spin valve but we find that this effect is much more pronounced with a temperature difference. We find that a spin asymmetry of the Seebeck coefficient of the order of 20 μV K~(-1) should be large enough for a temperature gradient of a few degrees to trigger the radio-frequency oscillations. Our semiclassical theory is fully parametrized with experimentally measured(able) parameters and allows one to quantitatively predict the amplitude of the torque.
机译:我们研究了在旋转阀上施加温差时产生的旋转转矩的角度依赖性。我们的研究表明,在这种角度依赖性中存在不平凡的不动点。该固定点为温度梯度无需外部磁场而稳定射频振荡提供了可能性。在自旋阀上施加电压差后,就已经可以发现这种所谓的“波浪状”行为,但是我们发现这种影响在温度差的情况下更为明显。我们发现,塞贝克系数的自旋不对称度约为20μVK〜(-1),应足以使温度梯度达到几度以触发射频振荡。我们的半经典理论已完全参数化,并通过实验测得的(可行的)参数进行了参数化设置,从而可以定量地预测扭矩的幅值。

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