Presentation Information
[3B06]Probing and controlling spin currents for magnetic memory technologies
*Masamitsu Hayashi1 (1. The University of Tokyo)
Recent studies have shown the unique characteristics of topological materials, such as topological insulators, Dirac and Weyl semimetals, as an efficient source of spin current. In many cases, it is the large spin Berry curvature associated with the electronic structure of the host material that facilitates generation of spin current. We have established optical means to assess current induced magnetic moments that accumulate at the surface. In the presentation, we discuss spin and orbital currents that emerge at the surface of topological materials. With spin current in metals under control, we have studied the current driven motion of magnetic domain walls in magnetic nanowires. We discuss the reliability of current driven domain wall motion in a ferrimagnetic racetrack. We show how the error rate varies against the strength of the driving force as well as the domain wall packing density.