Enhanced Nonadiabaticity in Vortex Cores due to the Emergent Hall Effect

André Bisig, Collins Ashu Akosa, Jung-Hwan Moon, Jan Rhensius, Christoforos Moutafis, Arndt von Bieren, Jakoba Heidler, Gillian Kiliani, Matthias Kammerer, Michael Curcic, Markus Weigand, Tolek Tyliszczak, Bartel Van Waeyenberge, Hermann Stoll, Gisela Schütz, Kyung-Jin Lee, Aurelien Manchon, Mathias Kläui

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Abstract

We present a combined theoretical and experimental study, investigating the origin of the enhanced nonadiabaticity of magnetic vortex cores. Scanning transmission x-ray microscopy is used to image the vortex core gyration dynamically to measure the nonadiabaticity with high precision, including a high confidence upper bound. We show theoretically, that the large nonadiabaticity parameter observed experimentally can be explained by the presence of local spin currents arising from a texture induced emergent Hall effect. This study demonstrates that the magnetic damping α and nonadiabaticity parameter β are very sensitive to the topology of the magnetic textures, resulting in an enhanced ratio (β/α>1) in magnetic vortex cores or Skyrmions.
Original languageEnglish (US)
JournalPhysical Review Letters
Volume117
Issue number27
DOIs
StatePublished - Dec 30 2016

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