论文标题
铁磁合金中的横向自旋电流的去向
Dephasing of Transverse Spin Current in Ferrimagnetic Alloys
论文作者
论文摘要
据预测，横向自旋电流可以在抗磁性有序的金属中在很长的距离内连贯地传播（无需驱动）。在这里，我们通过跨补偿点的自旋泵浦测量值来估计铁磁COGD合金中的横向自旋电流的垂直长度。一种修改的漂移扩散模型，该模型是通过Ferrimagnet传播的自旋流动的，该模型表明，在接近补偿的COGD中，脱位长度比铁磁金属的长度约为4-5倍。这一发现表明，抗铁磁序可以减轻自旋去向 - 即使在室温下结构无序的合金中，也类似于与自旋回声相似的方式。我们还发现证据表明，横向旋转电流与CO Sublattice相比，与GD Sublattice相互作用。我们的结果提供了对自旋电流和抗磁磁性之间的相互作用的基本见解，这对于铁磁性和抗铁磁金属的工程旋转扭矩效应至关重要。
It has been predicted that transverse spin current can propagate coherently (without dephasing) over a long distance in antiferromagnetically ordered metals. Here, we estimate the dephasing length of transverse spin current in ferrimagnetic CoGd alloys by spin pumping measurements across the compensation point. A modified drift-diffusion model, which accounts for spin-current transmission through the ferrimagnet, reveals that the dephasing length is about 4-5 times longer in nearly compensated CoGd than in ferromagnetic metals. This finding suggests that antiferromagnetic order can mitigate spin dephasing -- in a manner analogous to spin echo rephasing for nuclear and qubit spin systems -- even in structurally disordered alloys at room temperature. We also find evidence that transverse spin current interacts more strongly with the Co sublattice than the Gd sublattice. Our results provide fundamental insights into the interplay between spin current and antiferromagnetic order, which are crucial for engineering spin torque effects in ferrimagnetic and antiferromagnetic metals.
