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Rotating skyrmion lattices by spin torques and field or temperature gradients

机译:通过自旋扭矩和场或温度梯度旋转天体离子晶格

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摘要

Chiral magnets like MnSi form lattices of skyrmions, i.e., magnetic whirls, which react sensitively to small electric currents j above a critical current density j_c. The interplay of these currents with tiny gradients of either the magnetic field or the temperature can induce a rotation of the magnetic pattern for j > j_c. Either a rotation by a finite angle of up to 15° or-for larger gradients-a continuous rotation with a finite angular velocity is induced. We use Landau-Lifshitz-Gilbert equations extended by extra damping terms in combination with a phenomenological treatment of pinning forces to develop a theory of the relevant rotational torques. Experimental neutron scattering data on the angular distribution of skyrmion lattices suggest that continuously rotating domains are easy to obtain in the presence of remarkably small currents and temperature gradients.
机译:诸如MnSi之类的手性磁铁形成天体离子的晶格,即磁涡流,它们对高于临界电流密度j_c的小电流j敏感地做出反应。这些电流与磁场或温度的微小梯度的相互作用会导致j> j_c时磁模式的旋转。旋转到最大15°的有限角度,或者-对于较大的坡度-会以有限的角速度进行连续旋转。我们使用通过附加阻尼项扩展的Landau-Lifshitz-Gilbert方程,结合对销钉力的现象学处理,来开发相关旋转扭矩的理论。关于天蝎子晶格角分布的实验中子散射数据表明,在存在非常小的电流和温度梯度的情况下,易于获得连续旋转的畴。

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