Interfacial Dzyaloshinskii-Moriya Interaction: Effect of 5d Band Filling and Correlation with Spin Mixing Conductance

Xin Ma, Guoqiang Yu, Chi Tang, Xiang Li, Congli He, Jing Shi, Kang L. Wang, Xiaoqin Li

Research output: Contribution to journalArticlepeer-review

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) at the heavy metal (HM) and ferromagnetic metal (FM) interface has been recognized as a key ingredient in spintronic applications. Here we investigate the chemical trend of DMI on the 5d band filling (5d3-5d10) of the HM element in HM/FM (FM=CoFeB,Co)/MgO multilayer thin films. DMI is quantitatively evaluated by measuring asymmetric spin wave dispersion using Brillouin light scattering. Sign reversal and 20 times modification of the DMI coefficient D have been measured as the 5d HM element is varied. The chemical trend can be qualitatively understood by considering the 5d and 3d bands alignment at the HM/FM interface and the subsequent orbital hybridization around the Fermi level. Furthermore, a correlation is observed between DMI and effective spin mixing conductance at the HM/FM interfaces. Our results provide new insights into the interfacial DMI for designing future spintronic devices.

Original languageEnglish
Article number157204
JournalPhysical review letters
Volume120
Issue number15
DOIs
Publication statusPublished - 2018 Apr 13

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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