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Unidirectional tilt of domain walls in equilibrium in biaxial stripes with Dzyaloshinskii–Moriya interaction

Pylypovskyi, Oleksandr V; Kravchuk, Volodymyr P; Volkov, Oleksii M; Faßbender, Jürgen; Sheka, Denis D; Makarov, Denys

Abstract:
The orientation of a chiral magnetic domain wall in a racetrack determines its dynamical properties. In equilibrium, magnetic domain walls are expected to be oriented perpendicular to the stripe axis. We demonstrate the appearance of a unidirectional domain wall tilt in out-of-plane magnetized stripes with biaxial anisotropy and Dzyaloshinskii–Moriya interaction (DMI). The tilt is a result of the interplay between the in-plane easy-axis anisotropy and DMI. We show that the additional anisotropy and DMI prefer different domain wall structure: anisotropy links the magnetization azimuthal angle inside the domain wall with the anisotropy direction in contrast to DMI, which prefers the magnetization perpendicular to the domain wall. Their balance with the energy gain due to domain wall extension defines the equilibrium magnetization the domain wall tilting. We demonstrate that the Walker field and the corresponding Walker velocity of the domain wall can be enhanced in the system supporting tilted walls.

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DOI: 10.5445/IR/1000123892
Veröffentlicht am 21.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 0022-3727, 1361-6463
KITopen-ID: 1000123892
Erschienen in Journal of physics / D
Band 53
Heft 39
Seiten Art. Nr.: 395003
Vorab online veröffentlicht am 09.07.2020
Schlagwörter domain wall, Dzyaloshinskii–Moriya interaction, Walker limit, magnetism
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