Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Spincaloric Transport
(Joint session of MA and TT organized by MA)

TT 18.11: Vortrag

Montag, 7. März 2016, 17:45–18:00, H31

Thermally excited magnon accumulation in complex magnetic materials — •Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak — Universität Konstanz, Konstanz, Germany

It was shown experimentally that in a magnetic insulator spin currents can be created by applying temperature gradients [1]. Using atomistic spin model simulations, we study magnonic spin currents and their characteristic length scales in ferromagnetic materials with different temperature profiles [2,3,4]. Furthermore, we explore thermally excited spin currents in antiferromagnetic materials and study the magnon accumulation in the vicinity of a temperature step and its characteristic length scale. We determine the different antiferromagnetic modes that are excited and discuss their propagation length using an one-dimensional analytical model.

These methods can be extended for ferrimagnetic materials. In a two-sublattice ferrimagnet, we determine the thermally excited magnon accumulation due to a temperature step. We study the temperature dependence of the magnon accumulation in ferrimagnets and investigate under which condition the magnon accumulation in such systems vanishes.

We acknowledge financial support by the DFG through SFB 767 and through SPP "Spin Caloric Transport".

[1] K. Uchida et al, Appl. Phys. Lett. 97, 172505 (2010)

[2] U. Ritzmann et al., Phys. Rev. B 89, 024409 (2014)

[3] A. Kehlberger et al.,Phys. Rev. Lett. 115, 096602 (2015)