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HL: Fachverband Halbleiterphysik

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

HL 22.2: Hauptvortrag

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

Spin Seebeck effect in metals and insulators — •Ken-ichi Uchida and Eiji Saitoh — Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Recent studies on spintronics and spin caloritronics have revealed that a spin current, a flow of spin angular momentum, is strongly coupled with a heat current in various magnetic systems. From both basic science and applied engineering points of view, the interplay of these two currents is of crucial importance. The spin-Seebeck effect (SSE) [1-6] is a phenomenon enabling the conversion of heat currents into spin voltage, a potential for driving nonequilibrium spin currents, in ferromagnets.

In this paper, we report the experimental observation of the SSE in ferromagnetic metals [1] and insulators [3,5]. The SSE drives a spin current flowing across an interface between a ferromagnet and an attached Pt film and the spin current is converted into electric voltage by the inverse spin-Hall effect [7] in the Pt film.

This work was supported by a Grant-in-Aid for Scientific research in Priority Area "Creation and Control of Spin Current" and Scientific Research A from MEXT, Japan.

[1] K. Uchida et al., Nature 455, 778 (2008). [2] J. Xiao et al., Phys. Rev. B 81, 214418 (2010). [3] K. Uchida et al., Nature Mater. 9, 894 (2010). [4] C. M. Jaworski et al., Nature Mater. 9, 898 (2010). [5] K. Uchida et al., Appl. Phys. Lett. 97, 172505 (2010). [6] H. Adachi et al., arXiv:1010.2325 (2010). [7] E. Saitoh et al., Appl. Phys. Lett. 88, 182509 (2006).