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Domain wall diode based on functionally graded Dzyaloshinskii–Moriya interaction

Yershov, Kostiantyn V.; Kravchuk, Volodymyr P.; Sheka, Denis D.; van den Brink, Jeroen; Saxena, Avadh

Abstract:
We present a general approach for studying the dynamics of domain walls in biaxial ferromagnetic stripes with functionally graded Dzyaloshinskii-Moriya interaction (DMI). By engineering the spatial profile of the DMI parameter we propose the concept of a diode, which implements filtering of domain walls of certain topological charge and helicity. We base our study on phenomenological Landau-Lifshitz-Gilbert equations with additional Zhang-Li spin-transfer terms using a collective variable approach. In the effective equations of motion the gradients of DMI play the role of a driving force which competes with current driving. All analytical predictions are confirmed by numerical simulations.



Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 06.2020
Sprache Englisch
Identifikator KITopen-ID: 1000124894
Nachgewiesen in arXiv
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