Current-induced skyrmion generation and dynamics in symmetric bilayers

A. Hrabec (), J. Sampaio, M. Belmeguenai, I. Gross, R. Weil, S. M. Chérif, A. Stashkevich, V. Jacques, A. Thiaville and S. Rohart ()
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A. Hrabec: Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502
J. Sampaio: Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502
M. Belmeguenai: LSPM (CNRS-UPR 3407), Université Paris 13, Sorbonne Paris Cité
I. Gross: Laboratoire Charles Coulomb, Université de Montpellier and CNRS UMR 5221
R. Weil: Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502
S. M. Chérif: LSPM (CNRS-UPR 3407), Université Paris 13, Sorbonne Paris Cité
A. Stashkevich: LSPM (CNRS-UPR 3407), Université Paris 13, Sorbonne Paris Cité
V. Jacques: Laboratoire Charles Coulomb, Université de Montpellier and CNRS UMR 5221
A. Thiaville: Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502
S. Rohart: Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Magnetic skyrmions are quasiparticle-like textures which are topologically different from other states. Their discovery in systems with broken inversion symmetry sparked the search for materials containing such magnetic phase at room temperature. Their topological properties combined with the chirality-related spin–orbit torques make them interesting objects to control the magnetization at nanoscale. Here we show that a pair of coupled skyrmions of opposite chiralities can be stabilized in a symmetric magnetic bilayer system by combining Dzyaloshinskii–Moriya interaction (DMI) and dipolar coupling effects. This opens a path for skyrmion stabilization with lower DMI. We demonstrate in a device with asymmetric electrodes that such skyrmions can be independently written and shifted by electric current at large velocities. The skyrmionic nature of the observed quasiparticles is confirmed by the gyrotropic force. These results set the ground for emerging spintronic technologies where issues concerning skyrmion stability, nucleation and propagation are paramount.

Date: 2017
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DOI: 10.1038/ncomms15765

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