Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Spin: Transport, Orbitronics and Hall Effects I

MA 46.11: Talk

Thursday, March 19, 2020, 12:15–12:30, HSZ 403

Spin currents in collinear and non-collinear antiferromagnets — •Jakub Železný — Institute of Physics of the Czech Academy of Sciences, Prague 6, Czech Republic

Spin currents are one of the key concepts of spintronics. In the past, two types of spin currents have been predominantly discussed and utilized: the spin-polarized current in ferromagnetic materials and the spin Hall effect. In recent years it has been discovered that the phenomenology of spin currents is much richer than previously thought, and that more types of spin currents can occur. We have shown that the spin-polarized current can also exist in some antiferromagnetic materials and that a new type of spin Hall effect exists, which has origin in the magnetic order, and occurs in ferromagnetic and some antiferromagnetic materials [1]. This effect is now referred to as the magnetic spin Hall effect and has been recently experimentally demonstrated in non-collinear antiferromagnet Mn3Sn [2]. Furthermore, we have shown that the conventional spin Hall effect can exist in some non-collinear magnetic systems even in absence of the relativistic spin-orbit interaction [3]. Here we review the various types of spin currents that can occur in magnetic systems and give general conditions for their existence as well as a symmetry classification. In addition, we present calculations of these novel spin currents in various collinear and non-collinear antiferromagnets.

[1] J. Železný et al.: Phys. Rev. Lett. 119, 187204 (2017) [2] M. Kimata et al., Nature 565, 627 (2019) [3] Y. Zhang et al: New J. Phys. 20, 073028 ( 2018 )