Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 92: Focus Session: Spinorbitronics - From Efficient Charge/Spin Conversion Based on Spin-Orbit Coupling to Chiral Magnetic Skyrmions II (joint session MA/TT)

TT 92.4: Vortrag

Donnerstag, 15. März 2018, 16:00–16:15, H 1012

Orbital fingerprints of skyrmions in ferro- and antiferromagnets — •Manuel dos Santos Dias and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

X-rays are a very powerful tool for investigating the magnetic properties of materials. The magnetic circular dichroism in ferromagnets can be combined with sum rules to separate the net spin and orbital magnetic moments, while compensated antiferromagnets have no circular dichroism. In this contribution, we explain why skyrmions in ferromagnets encode topological information in their orbital magnetic moment, that can in principle be extracted via sum-rule analysis [1]. This part of the orbital moment originates from magnetic noncoplanarity, as found in our original work and in a simple model description [2]. We then extend the analysis to a skyrmion lattice in an antiferromagnetic background. We investigate whether the topological orbital signature is present, and whether circular dichroism exists and can detect topological information.

This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] M. dos Santos Dias et al., Nat. Commun. 7, 13613 (2016)
[2] M. dos Santos Dias and S. Lounis, Proc. SPIE 10357, Spintronics X, 103572A (2017)