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VIDEO DOI: https://doi.org/10.48448/a4cr-cm96

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Magneto ionic and electrostatic generation of non

Magnetic skyrmions are topological spin textures with great potential for spintronics applications (1). The appearance of skyrmions requires a careful balance between the magnetic anisotropy and the Dzyaloshinskii-Moriya interaction, and being able to tune these values with a voltage is an important tool for material optimisation for skyrmion devices.

In this work we have explored generation of both volatile and non-volatile skyrmions in MgO/Mn2CoAl/Pd thin films using different ionic liquid gating voltage sequences and magneto-optical Kerr effect (MOKE) microscopy. With a negative gate voltage of -2.5 V, we are able to generate non-volatile skyrmions ~ 1 μm diameter in films with perpendicular magnetic anisotropy Keff ~ 1 x 104 Jm-3. The same result is achieved in higher Keff films by ‘training’ or repeatedly cycling the gate voltage, achieving a giant voltage tunability of magnetic anisotropy of 109.8 mT V-1. Interestingly, volatile skyrmions can also be generated, by first applying a large negative ‘trigger’ voltage, and then skyrmions appear at a positive gate voltage. Using X-ray photoelectron spectroscopy, we explain the generation of skyrmions in terms of magneto-ionic and electrostatic effects (2). Our results show the potential of ionic liquid gating for achieving large anisotropy changes to reversibly or irreversibly generate skyrmions from materials with a range of starting anisotropy values.

(1) X. Zhang, Y. Zhou, K. M. Song, T.-E. Park, J. Xia, M. Ezawa, X. Liu, W. Zhao, G. Zhao, and S. Woo, J. Phys. Cond. Mat. 32, 143001 (2020).
(2) Y. Zhang, G. Dubuis, C. Doyle, T. Butler, and S. Granville, Phys. Rev. Appl. 16, 014030 (2021).


Transcript English (automatic)

Next from MMM 2022

Zero field Magnetic Skyrmions in Multilayer Films Stabilized by Interplay of Interlayer Exchange Couplings
technical paper

Zero field Magnetic Skyrmions in Multilayer Films Stabilized by Interplay of Interlayer Exchange Couplings

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+4Pin HoXiaoye Chen
Xiaoye Chen and 6 other authors

07 November 2022

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