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arXiv · 1511.06585

Enhanced Non-Adiabaticity 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 non-adiabaticity of magnetic vortex cores. Scanning transmission X-ray microscopy is used to image the vortex core gyration dynamically to measure the non-adiabaticity with high precision, including a high confidence upper bound. Using both numerical computations and analytical derivations, we show that the large non-adiabaticity parameter observed experimentally can be explained by the presence of local spin currents arising from a texture-induced emergent Hall effect. This enhanced non-adiabaticity is only present in two- and three-dimensional magnetic textures such as vortices and skyrmions and absent in one-dimensional domain walls, in agreement with experimental observations.

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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. 2015-11-20. Enhanced Non-Adiabaticity in Vortex Cores due to the Emergent Hall Effect. https://doi.org/10.1103/physrevlett.117.277203

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