Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Magnetic Textures: Statics and Imaging I

MA 7.7: Vortrag

Montag, 1. April 2019, 16:45–17:00, H37

Magnetic bimerons as skyrmion analogues in in-plane magnets — •Börge Göbel1, Alexander Mook2, Jürgen Henk2, Ingrid Mertig1,2, and Oleg A. Tretiakov3,41Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle (Saale), Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle (Saale), Germany — 3Institute for Materials Research and Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan — 4School of Physics, The University of New South Wales, Sydney 2052, Australia

A magnetic bimeron [1] is a pair of two merons and can be understood as the in-plane magnetized version of a skyrmion. Here [2] we theoretically predict the existence of single magnetic bimerons as well as bimeron crystals, and compare the emergent electrodynamics of bimerons with their skyrmion analogues. We show that bimeron crystals can be stabilized in frustrated magnets and analyze what crystal structure can stabilize bimerons or bimeron crystals via the Dzyaloshinskii-Moriya interaction. We point out that bimeron crystals, in contrast to skyrmion crystals, allow for the detection of a pure topological Hall effect. By means of micromagnetic simulations, we show that bimerons can be used as bits of information in in-plane magnetized racetrack devices, where they allow for current-driven motion for torque orientations that leave skyrmions in out-of-plane magnets stationary.

[1] Y. Kharkov, et al., Phys. Rev. Lett. 119, 207201 (2017)

[2] B. Göbel, et al., arXiv: 1811.07068 (2018)

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