Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 27: Spin currents and spin torques

MA 27.4: Vortrag

Mittwoch, 14. März 2018, 10:15–10:30, EB 407

Collective spin transport in easy-plane systems — •Martin Evers, Pascal Bolz, and Ulrich Nowak — University of Konstanz, D-78457 Konstanz

Spin transport has many aspects. It can occure as a spin polarized current or a magnon flow, moving magnetic textures as domain walls, spin spirals or skyrmions. One specific kind of transport is a collective spin current in an easy-plane magnet, that is called a spin superfluid [1,2]. This transport is predicted to be long-ranged and should also have a protection against dissipation. Within this framework also dissipationless spin transport has been predicted [1,3].

In our work, we study this spin superfluid transport numerically in an atomistic spin model in order to get insight into the possible mechanisms to drive such a supercurrent, to investigate the dissipation and the characteristic length scale of the transport. The systems we study include ferro- and antiferromagnets, as well as spin spirals and different driving mechanisms, such as a time-dependent Dzyloshinskii-Moriya interaction (originating from an electric field in an multiferroic material) [3], an injected spin accumulation and temperature gradients.

[1] J. König et al., Phys. Rev. Lett. 87, 187202 (2001)
S. Takei et al., Phys. Rev. Lett. 112, 227201 (2014)
W. Chen et al., Phys. Rev. Lett. 114, 157203 (2015)