Dresden 2017 – wissenschaftliches Programm
MA 61.7: Vortrag
Freitag, 24. März 2017, 11:00–11:15, HSZ 401
Single magnetic skyrmions and skyrmion clusters in the helical phase — •Jan Müller1, Rajeswari Jayaraman2, Fabrizio Carbone2, and Achim Rosch1 — 1Institut für Theoretische Physik, Universität zu Köln, D-50937 Köln, Germany — 2École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
Magnetic skyrmions are tiny magnetic whirls which can be stabilized by spin-orbit interactions in magnets lacking inversion symmetry. They are small, extremely stable and can be manipulated by tiny forces. The properties of skyrmions embedded in a ferromagnetic environment have been intensively studied. I will show that within our numerical simulations single skyrmions and clusters of skyrmions can also form in a helical phase and investigate theoretically the energetics and dynamics of such skyrmions. The helical background provides natural one-dimensional channels along which a skyrmion can move rapidly. In contrast to skyrmions in ferromagnets, the skymion-skyrmion interaction has a strong attractive component and thus skyrmions tend to form clusters with characteristic shapes. These clusters are directly observed in transmission electron microscopy measurements in films of the insulating skyrmion material Cu2OSeO3. Topological quantization, high mobility and the confinement in channels may be useful for future spintronics devices.