Spin hydrodynamics in amorphous magnets
Spin hydrodynamics in amorphous magnets
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DOI：
10.1103/physrevb.98.054424
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发表时间：
2018-08-23
影响因子：
3.7
通讯作者：
Tserkovnyak, Yaroslav
中科院分区：
文献类型：
--
作者：
Ochoa, Hector;Zarzuela, Ricardo;Tserkovnyak, Yaroslav
自旋超流动性，即由拓扑稳定纹理介导的相干自旋传输，受到源于相对论相互作用和空间不均匀性的寄生各向异性的限制。由于非晶磁体中的结构无序可以平衡这些不需要的耦合的影响，因此我们建议将此类材料作为超流体自旋传输的平台。我们建立了非线性方程来描述绝缘非晶磁体中自旋的流体动力学，其中电流是根据非共线纹理的相干旋转来定义的。我们的理论包括与金属储层界面处的耗散和非平衡扭矩。该框架使我们能够确定相干动力学的不同机制及其在非局域磁输运测量中的显着特征。我们的工作为未来研究相互作用受阻材料的宏观自旋动力学铺平了道路。
Spin superfluidity, i.e., coherent spin transport mediated by topologically stable textures, is limited by parasitic anisotropies rooted in relativistic interactions and spatial inhomogeneities. Since structural disorder in amorphous magnets can average out the effect of these undesired couplings, we propose this class of materials as platforms for superfluid spin transport. We establish nonlinear equations describing the hydrodynamics of spin in insulating amorphous magnets, where the currents are defined in terms of coherent rotations of a noncollinear texture. Our theory includes dissipation and nonequilibrium torques at the interface with metallic reservoirs. This framework allows us to determine different regimes of coherent dynamics and their salient features in nonlocal magnetotransport measurements. Our work paves the way for future studies on macroscopic spin dynamics in materials with frustrated interactions.