Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 14: INNOMAG e.V. Dissertationspreis 2019 / Ph.D. Thesis Prize

MA 14.3: Talk

Tuesday, April 2, 2019, 10:30–11:00, H48

Topological properties of complex magnets from an advanced ab-initio Wannier description — •Jan-Philipp Hanke — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich

Our understanding of many fundamental effects in solids has been revolutionized by the advent of Berry phases [1]. In particular, the recent discovery that Berry phases in momentum space relate to orbital electronic properties allows us to predict from theoretical arguments pronounced orbital magnetism in various situations, ranging from Rashba systems to Chern insulators [2-4]. We demonstrate that the combined complex geometry of real and momentum space manifests in topological orbital magnetism in non-collinear magnets, which offers new avenues for magnetization manipulation and large current-induced orbital responses in antiferromagnets [2,3]. By developing and applying advanced ab-initio methods [5,6], we finally predict that in insulators with non-trivial topologies the magnitude of magneto-electric effects in terms of spin-orbit torques can significantly exceed that of conventional metallic magnets, which lays out highly attractive perspectives for energy-efficient magnetization control of nanomagnets [7].

[1] M. Berry, Proc. R. Soc. Lond. A 392, 45 (1984). [2] J.-P. Hanke et al, Phys. Rev. B 94, 121114(R) (2016). [3] J.-P. Hanke et al, Sci. Rep. 7, 41078 (2017). [4] D. Go, J.-P. Hanke et al, Sci. Rep. 7, 46742 (2017). [5] J.-P. Hanke et al, Phys. Rev. B 91, 184413 (2015). [6] J.-P. Hanke et al, J. Phys. Soc. Jpn. 87, 041010 (2018). [7] J.-P. Hanke et al, Nature Comm. 8, 1479 (2017).