Reversal of domain wall chirality with ferromagnet thickness in W/(Co)FeB/MgO systems

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2 Citations (Scopus)

Abstract

We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on domain wall (DW) configurations in W/(Co)FeB/MgO structures with varying ferromagnet (FM) thicknesses. The DW chirality and effective DMI field are evaluated from field-induced DW motion. The results indicate a reversal of DW chirality with the FM thickness irrespective of the FM material (CoFeB or FeB) and the crystallographic phase of W (α or β phase). The observed change in the magnitude of the DMI field is supported by an additional measurement of spin-orbit torque assisted magnetization switching under in-plane magnetic fields. The present findings offer previously unknown insights into the origin of interfacial DMI and indicate the co-existence of multiple factors governing DW chirality in systems with broken inversion symmetry.

Original languageEnglish
Article number042405
JournalApplied Physics Letters
Volume114
Issue number4
DOIs
Publication statusPublished - 2019 Jan 28

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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