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 57.7: Vortrag
Freitag, 16. März 2018, 12:00–12:15, H 1012
Field-free deterministic ultrafast creation of magnetic skyrmions by spin--orbit torques — Felix Büttner1, Ivan Lemesh1, Michael Schneider2, •Bastian Pfau2, Christian M. Günther2,3, Piet Hessing2, Jan Geilhufe2, Lucas Caretta1, Dieter Engel2, Benjamin Krüger4, Jens Viefhaus5, Stefan Eisebitt2, and Geoffrey S. D. Beach1 — 1Massachusetts Institute of Technology, Cambridge, USA. — 2Max-Born-Institut, Berlin, Germany. — 3TU Berlin, Berlin, Germany. — 4Institut für Lasertechnologien in der Medizin und Messtechnik an der Universität Ulm, Ulm, Germany. — 5Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany.
Magnetic skyrmions are a very promising option to realize current-driven magnetic shift registers. Generation, transport and annihilation of skyrmions are fundamental operations in this context. We study the generation and intrinsic dynamics of bubble skyrmions via static and time-resolved X-ray holography, combining sub-30 nm spatial resolution with sub-100 ps temporal resolution. It is demonstrated that single skyrmions can be generated deterministically on subnanosecond timescales in magnetic racetracks using spin--orbit torque pulses. Externally applied in-plane magnetic fields are not required in the process. Furthermore, results on the GHz dynamical behavior of bubble skyrmions are presented, where precision observation of the skyrmion trajectory is indicative of the presence of an inertial mass, connected to the skyrmion topology.