Gate-controlled skyrmion and domain wall chirality

Charles-Elie Fillion, Johanna Fischer, Raj Kumar, Aymen Fassatoui, Stefania Pizzini, Laurent Ranno, Djoudi Ourdani, Mohamed Belmeguenai, Yves Roussigné, Salim-Mourad Chérif, Stéphane Auffret, Isabelle Joumard, Olivier Boulle, Gilles Gaudin, Liliana Buda-Prejbeanu, Claire Baraduc and Hélène Béa ()
Additional contact information
Charles-Elie Fillion: Université Grenoble Alpes, CEA, CNRS, Spintec
Johanna Fischer: Université Grenoble Alpes, CEA, CNRS, Spintec
Raj Kumar: Université Grenoble Alpes, CEA, CNRS, Spintec
Aymen Fassatoui: Université Grenoble Alpes, CNRS, Néel Institute
Stefania Pizzini: Université Grenoble Alpes, CNRS, Néel Institute
Laurent Ranno: Université Grenoble Alpes, CNRS, Néel Institute
Djoudi Ourdani: Laboratoire des Sciences des Procédés et des Matériaux (LSPM)
Mohamed Belmeguenai: Laboratoire des Sciences des Procédés et des Matériaux (LSPM)
Yves Roussigné: Laboratoire des Sciences des Procédés et des Matériaux (LSPM)
Salim-Mourad Chérif: Laboratoire des Sciences des Procédés et des Matériaux (LSPM)
Stéphane Auffret: Université Grenoble Alpes, CEA, CNRS, Spintec
Isabelle Joumard: Université Grenoble Alpes, CEA, CNRS, Spintec
Olivier Boulle: Université Grenoble Alpes, CEA, CNRS, Spintec
Gilles Gaudin: Université Grenoble Alpes, CEA, CNRS, Spintec
Liliana Buda-Prejbeanu: Université Grenoble Alpes, CEA, CNRS, Spintec
Claire Baraduc: Université Grenoble Alpes, CEA, CNRS, Spintec
Hélène Béa: Université Grenoble Alpes, CEA, CNRS, Spintec

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Magnetic skyrmions are localized chiral spin textures, which offer great promise to store and process information at the nanoscale. In the presence of asymmetric exchange interactions, their chirality, which governs their dynamics, is generally considered as an intrinsic parameter set during the sample deposition. In this work, we experimentally demonstrate that a gate voltage can control this key parameter. We probe the chirality of skyrmions and chiral domain walls by observing the direction of their current-induced motion and show that a gate voltage can reverse it. This local and dynamical reversal of the chirality is due to a sign inversion of the interfacial Dzyaloshinskii-Moriya interaction that we attribute to ionic migration of oxygen under gate voltage. Micromagnetic simulations show that the chirality reversal is a continuous transformation, in which the skyrmion is conserved. This control of chirality with 2–3 V gate voltage can be used for skyrmion-based logic devices, yielding new functionalities.

Date: 2022
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DOI: 10.1038/s41467-022-32959-w

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