The topological properties of magnets, encoded in the reciprocal space distribution of the
Berry phase, have caused a revolution in our understanding of their transport properties.
The discovery that the non-trivial geometry of states in a solid is ultimately related to
the orbital properties of electrons allows us to predict from theoretical arguments a
pronounced orbital magnetism in various situations ranging from Rashba systems to Chern
insulators. Moreover, we demonstrate that a combination of complex geometry in real and
reciprocal spaces leads to an emergence of topological orbital magnetism in non-collinear
magnets, which overall opens new vistas in large current-induced orbital magnetization
response and magnetization manipulation in antiferromagnets. Finally, we predict that in
insulating systems with non-trivial topologies the strength of the magneto-electric response
as manifested in the magnitude of the current-induced spin-orbit torques and Dzyaloshinskii-Moriya
interaction can exceed significantly that of conventional metallic magnets, which opens new
perspectives in dissipationless control of magnetization in magnetic materials.
Jan-Philipp Hanke, Dongwook Go, Patrick Buhl, Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov, "Emergent orbitronics and dissipationless magnetization control in complex magnets (Conference Presentation)," Proc. SPIE 10357, Spintronics X, 103570Z (Presented at SPIE Nanoscience + Engineering: August 08, 2017; Published: 19 October 2017); https://doi.org/10.1117/12.2273819.5617946881001.
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