Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 22: SKM Symposium: Spin Caloric Transport (SYST)

HL 22.1: Hauptvortrag

Montag, 14. März 2011, 14:30–15:00, TRE Ma

On the theory of the spin wave Seebeck effect — •Gerrit Bauer — Kavli Institute of NanoScience, TU Delft, Netherlands

The spin Seebeck effect, discovered by Uchida et al. [1], has been observed in various ferromagnets, such as the metal Py [1], insulating Yttrium Iron Garnet (YIG) [2], the semiconductor GaAlMn [3] and the Heusler compound Co2MnSi [4]. Possibly, the effect is caused by the non-equilibrium spin wave dynamics induced by a thermal gradient, which leads to a net spin current injected by the ferromagnet into a normal metal contact [5,6]. This mechanism appears to explain experiments on the spin Seebeck effect in YIG [2]. This talk will address new theoretical developments to understand the spin (wave) Seebeck effect.

The reported results have been obtained in collaboration with J. Xiao, K. Xia, K. Uchida, E. Saitoh, and S. Maekawa and has been support by the Dutch FOM foundation.

[1] K. Uchida et al., Nature 445, 778-781 (2008).

[2] K. Uchida et al., Nature Mater. 9, 894 (2010).

[3] C.M. Jaworski et al., Nature Mater. 9 , 898 (2010).

[4] S. Bosu et al., unpublished.

[5] J. Xiao et al., Phys. Rev. B 81, 214418 (2010).

[6] H. Adachi et al., arXiv:1010.2325.