Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Skyrmions II (joint session MA/TT/KFM)
TT 37.9: Vortrag
Dienstag, 13. März 2018, 12:00–12:15, EB 301
Magnetoelectric effect and orbital magnetization in skyrmion crystals: new ways for detection and characterization of skyrmions — •Börge Göbel1, Alexander Mook2, Jürgen Henk2, and Ingrid Mertig1,2 — 1Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle — 2Institut für Physik, Martin-Luther-Universität, D-06120 Halle
Skyrmions are small magnetic quasiparticles, which are uniquely characterized by their topological charge and their helicity. We present theoretically how both properties can be determined without relying on real-space imaging [1].
The topological Hall effect of electrons allows to distinguish skyrmions from antiskyrmions by sign of the topological Hall conductivity [2,3] and the orbital magnetization [1]. Here, we predict a magnetoelectric effect in skyrmion crystals [1], which is the generation of a magnetization (polarization) by application of an electric (magnetic) field. Its dependence on the skyrmion helicity fits that of the classical toroidal moment of the spin texture and allows to differentiate skyrmion helicities: it is largest for Bloch skyrmions and zero for Néel skyrmions. We predict distinct features in the magnetoelectric polarizability that can be used to detect and characterize skyrmions in experiments.
[1] B. Göbel et al., submitted.
[2] B. Göbel et al., Phys. Rev. B 95, 094413 (2017).
[3] B. Göbel et al., New J. Phys. 19, 063042 (2017).