Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Non-Skyrmionic Magnetic Textures
MA 55.2: Talk
Thursday, March 19, 2020, 15:15–15:30, POT 6
Topological Hall signatures of electrons in magnetic hopfions — •Börge Göbel1,2, Collins Akosa3,4, Gen Tatara3,5, and Ingrid Mertig1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany — 3RIKEN Center for Emergent Matter Science (CEMS), Hirosawa, Wako, Saitama, Japan — 4Department of Theoretical and Applied Physics, African University of Science and Technology (AUST), Galadimawa, Abuja F.C.T, Nigeria — 5RIKEN Center for Pioneering Research (CPR), Hirosawa, Wako, Saitama, Japan
Magnetic hopfions are topologically protected three-dimensional solitons that are constituted by a tube which exhibits a topologically non-trivial spin texture in the cross-section profile and is closed to a torus. We show that the topological Hall effect of electrons in such spin textures vanishes on the global level. However, in a local measurement, where the hopfion is located asymmetrically between two leads, a purely topological Hall signature arises due to the locally uncompensated emergent field. This fundamental effect can be exploited to electrically detect hopfions in experiments and to distinguish them from skyrmion tubes. Furthermore, it can potentially be utilized in spintronic devices. We propose a hopfion-based racetrack storage device and discuss switching of currents by tilting the stabilizing magnetic field.