Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Spin dynamics and transport
MA 26.11: Vortrag
Mittwoch, 3. April 2019, 12:15–12:30, H37
Long-ranged spin transport in magnetism: the role of topology and frustration — •Ricardo Zarzuela1, Héctor Ochoa2, Yaroslav Tserkovnyak3, and Jairo Sinova1 — 1Institute of Physics, Johannes Gutenberg-Universität, 55128 Mainz, Germany — 2Physics Department, Columbia University, New York, NY 10027, USA — 3Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
Spintronics offers new routes towards the design of energy-efficient architectures for the next generation of high-speed electronic devices. However, it also faces the problem of fast degradation of spin signals resulting from decoherence processes. Topological protection of spin textures, rooted in the existence of energy barriers due to topological constraints, seems to play a fundamental role in overcoming this issue and leads to long relaxation lengths (algebraic vs. exponential decay). This robustness usually relies on the existence of an underlying rotational symmetry in spin space (e.g, the U(1) symmetry associated with conventional effective spin superfluids), which breaks down in the presence of parasitic (relativistic) interactions arising during the fabrication process of spintronic devices. In magnetic systems with frustrated interactions dominated by exchange, these symmetry-breaking interactions become "averaged-out" at the macroscopic level and the topological robustness is effectively restored. In this talk I will discuss recent theoretical advances in the long-ranged transport of spin in materials with frustrated (magnetic) interactions, with special attention to that mediated by the spin-superfluid state and skyrmions.