Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Surface Magnetism – Skyrmions (jointly with MA, O)

TT 14.1: Talk

Monday, March 16, 2015, 09:30–09:45, EB 301

Dynamics of spin spirals and skyrmions in temperature gradient — •Rocio Yanes, Denise Hinzke, and Ulrich Novak — Universität Konstanz, Konstanz, Germany

Recently, Dzyaloshinskii-Moriya (DM) interaction has attracted attention in magnetism since it can lead to the formation of skyrmions and spin spirals with promising applications in spintronics [1,2]. Furthermore, it has been shown that temperature gradients can cause magnonic spin currents and with that spin transfer torques leading to a movement of a domain wall in a magnetic nanowire [3,4]. In this work, we combined both topics to analyze the dynamics of two dimensional non-collinear magnetic textures subject to a temperature gradient.

Numerical calculations of the dynamics of helical spin spiral (HSS), skyrmion lattices and isolated skyrmions are carried out for different values of the temperature gradient and damping parameter. Our results show that the HSS moves towards the hotter area driven by the temperature gradient. The velocity of this movement is asymmetric with respect to the sign of the temperature gradient due to the effect of the DM interactions. We observe a clear difference between the movement of isolated skyrmions and skyrmion lattices. While in the first case, the skyrmion motion is determine by the temperature gradient and the Magnus force, in the case of a lattice of skyrmions the interaction between skyrmions plays a fundamental role.

[1] A. Fert et al. Nature Nanotech., 8, 152, (2013). [2] N. Nogoasa et al., Nature Nanotech., 8, 899 (2013). [3] D. Hinzke and U. Novak, PRL, 107, 027205 (2011). [4] Schlickeiser et al., PRL, 113, 097201 (2014).