Real-space and pulse-by-pulse analysis of domain wall creep induced by spin-Hall torque

Abstract

This study aims to investigate the creep motion of a magnetic domain wall (DW) induced by spin-Hall torque (SHT) in a Ta/Co-Ni/Pt heterostructured thin wire using photoemission electron microscopy. The displacement of the DW was recorded every time after the duration of an electric current pulse. Results revealed that the existence of pinning centers and the inhomogeneity of the thermal diffusion property of the wire may result in an unstable DW motion. On the contrary, this data also suggested that the SHT induced from both the Ta and Pt layers can significantly improve the DW velocity, which was found to be three orders of magnitude larger than that previously reported for the MgO/Co-Ni/Pt system (Taniguchi et al., Appl. Phys. Exp. 7, 053005 (2014)). (C) 2019 The Japan Society of Applied Physics