Reversal of domain wall chirality with ferromagnet thickness in W/(Co)FeB/MgO systems
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 D...
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Veröffentlicht in: | Applied physics letters 2019-01, Vol.114 (4) |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.5084095 |