Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 57: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions III (joint session MA/TT)
MA 57.9: Vortrag
Freitag, 16. März 2018, 12:30–12:45, H 1012
Skyrmion-Antiskyrmion racetrack memory in rank-1 DMI materials — M. Hoffmann1, B. Zimmermann1, G. P. Müller1,2, N. S. Kiselev1, C. Melcher3, and •S. Blügel1 — 1Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, Jülich, Germany — 2Science Institute of the University of Iceland, VR-III, Reykjavík, Iceland — 3Department of Mathematics I & JARA FIT, RWTH Aachen University, Aachen, Germany
Recently, we extended the scope of skyrmions and antiskyrmions and introduced a classification scheme of chiral magnets [1]. Typically investigated Bloch-type skyrmions in B20 alloys and Néel-type skyrmions at (111) oriented interfaces belong to isotropic rank-three DM bulk and rank-two DM film magnets with a DM interaction described by a single spiralization constant. Within this class, antiskyrmions are stable only for bulk crystals with certain point group symmetries. New are the anisotropic rank-two DMI film magnets where skyrmions and antiskyrmions can coexist while the determinant of the spiralization tensor determines which of them has lower energy. Finally, zero determinant indicates a rank-one DMI material in which skyrmions and antiskyrmions have the same energy. Here, we discuss our new classification scheme and discuss the potential of rank-one solids for the design of a racetrack memory based on the coexistence of skyrmions and antiskyrmions where the information is encoded in the object type instead of the presence or absence of a skyrmion [2].
[1] M. Hoffmann et al., Nat. Commun. 8, 308 (2017)
[2] M. Hoffmann et al., to be submitted