Emergent electrodynamics of topological spin textures

在skyrmions和相关的拓扑自旋纹理的磁化的非平凡的拓扑绕组产生了一个非常有效的耦合与自旋电流，这可以优雅地描述在一个涌现电动力学。潜在的新兴磁场和电场引起拓扑霍尔效应，并在自旋转移力矩（STT）诱导的自旋纹理流的存在下，新兴电场。我们建议进行全面的研究，在STT驱动的拓扑自旋纹理在选定的大块材料的涌现电动力学，专注于在各种条件下的拓扑自旋纹理的创建，运动和衰减。拟议的研究结合联合收割机运输和热力学信息获得的新一代的实验室为基础的技术与微观信息获得的新一代的中子和X射线散射技术。前者包括交流磁化率和磁STTs下，高分辨率扭矩磁，和电输运性质的振荡磁场和STTs下，而后者涉及超高分辨率中子光谱，以及动力学小角中子散射（SANS），动力学掠入射小角中子散射（GISANS）和共振弹性X射线散射（REXS）。

The non-trivial topological winding of the magnetization in skyrmions and related topological spin textures gives rise to an extremely efficient coupling with spin currents, that may be elegantly described in terms of an emergent electrodynamics. The underlying emergent magnetic and electric fields give rise to a topological Hall effect and, in the presence of spin transfer torque (STT) induced flow of the spin textures, an emergent electric field. We propose to perform comprehensive studies of the emergent electrodynamics in STT driven topological spin textures in selected bulk materials, focusing on the creation, motion and decay of topological spin textures under various conditions. The proposed studies combine transport and thermodynamic information obtained by means of a new generation of laboratory-based techniques with microscopic information obtained by means of a new generation of neutron and x-ray scattering techniques. The former includes ac susceptibility and magnetometry under STTs, high-resolution torque magnetometry, and electrical transport properties under oscillating magnetic fields and STTs, whereas the latter concern ultra-high-resolution neutron spectroscopy, as well as kinetic small angle neutron scattering (SANS), kinetic gracing incidence small angle neutron scattering (GISANS) and resonant elastic x-ray scattering (REXS).