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Current-driven skyrmion dynamics and drive-dependent skyrmion hall effect in an ultrathin film

DOI: 10.1103/PhysRevApplied.12.044007 DOI Help

Authors: Romeo Juge (Université Grenoble Alpes, CNRS, CEA) , Soong-geun Je (Université Grenoble Alpes, CNRS, CEA) , Dayane De Souza Chaves (Université Grenoble Alpes, CNRS, Institut Néel) , Liliana D. Buda-prejbeanu (Université Grenoble Alpes, CNRS, CEA) , José Peña-garcia (Université Grenoble Alpes, CNRS, Institut Néel) , Jayshankar Nath (Université Grenoble Alpes, CNRS, CEA) , Ioan Mihai Miron (Université Grenoble Alpes, CNRS, CEA) , Kumari Gaurav Rana (Université Grenoble Alpes, CNRS, CEA) , Lucia Aballe (ALBA Synchrotron Light Facility) , Michael Foerster (ALBA Synchrotron Light Facility) , Francesca Genuzio (Elettra-Sincrotrone Trieste) , Tevfik Onur Menteş (Elettra-Sincrotrone Trieste) , Andrea Locatelli (Elettra-Sincrotrone Trieste) , Francesco Maccherozzi (Diamond Light Source) , Sarnjeet S. Dhesi (Diamond Light Source) , Mohamed Belmeguenai (CNRS, Université Paris 13) , Yves Roussigné (CNRS, Université Paris 13) , Stéphane Auffret (Université Grenoble Alpes, CNRS, CEA) , Stefania Pizzini (Université Grenoble Alpes, CNRS, Institut Néel) , Gilles Gaudin (Université Grenoble Alpes, CNRS, CEA) , Jan Vogel (Université Grenoble Alpes, CNRS, Institut Néel) , Olivier Boulle (Université Grenoble Alpes, CNRS, CEA)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Applied , VOL 12

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 14035

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 / Mg O trilayer. We find that these skyrmions can be driven at a speed of 100 m s − 1 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.

Journal Keywords: Ferromagnetism; Hall effect; Skyrmions; Spintronics; Magnetic multilayers; Micromagnetic modeling; X-ray photoemission electron microscopy

Subject Areas: Physics, Materials


Instruments: I06-Nanoscience

Other Facilities: ALBA; Elettra