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arXiv · 1904.08275

Current-Driven Skyrmion Dynamics and Drive-Dependent Skyrmion Hall Effect in an Ultrathin Film

Roméo Juge·Soong-Geun Je·Dayane de Souza Chaves·Liliana D. Buda-Prejbeanu·José Peña-Garcia·Jayshankar Nath·Ioan Mihai Miron·Kumari Gaurav Rana·Lucia Aballe·Michael Foerster·Francesca Genuzio·Tevfik Onur Menteş·Andrea Locatelli·Francesco Maccherozzi·Sarnjeet S. Dhesi·Mohamed Belmeguenai·Yves Roussigné·Stéphane Auffret·Stefania Pizzini·Gilles Gaudin·Jan Vogel·Olivier Boulle
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Abstract

Magnetic skyrmions are chiral spin textures that hold great promise as nanoscale information carriers. Since their first observation at room temperature, progress has been made in their current-induced manipulation, with fast motion reported in stray-field-coupled multilayers. However, the complex spin textures with hybrid chiralities and large power dissipation in these multilayers limit their practical implementation and the fundamental understanding of their dynamics. Here, we report on the current-driven motion of Néel skyrmions with diameters in the 100-nm range in an ultrathin Pt/Co/MgO trilayer. We find that these skyrmions can be driven at a speed of 100 m/s and exhibit a drive-dependent skyrmion Hall effect, which is accounted for by the effect of pinning. Our experiments are well substantiated by an analytical model of the skyrmion dynamics as well as by micromagnetic simulations including material inhomogeneities. This good agreement is enabled by the simple skyrmion spin structure in our system and a thorough characterization of its static and dynamical properties.

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Roméo Juge, Soong-Geun Je, Dayane de Souza Chaves, Liliana D. Buda-Prejbeanu, José Peña-Garcia, Jayshankar Nath, Ioan Mihai Miron, Kumari Gaurav Rana, Lucia Aballe, Michael Foerster, Francesca Genuzio, Tevfik Onur Menteş, Andrea Locatelli, Francesco Maccherozzi, Sarnjeet S. Dhesi, Mohamed Belmeguenai, Yves Roussigné, Stéphane Auffret, Stefania Pizzini, Gilles Gaudin, Jan Vogel, Olivier Boulle. 2019-10-09. Current-Driven Skyrmion Dynamics and Drive-Dependent Skyrmion Hall Effect in an Ultrathin Film. https://doi.org/10.1103/physrevapplied.12.044007

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