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Seminars & Lectures

* TITLE

Spin Current, Charge Current, Heat Current and Spin-Electronics

* SPEAKERS

Name	Affiliation	E-mail
Prof. Sadamichi Maekawa	Tohoku Univ./ Japan Science and Technology Agency	sec(at)apctp.org

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2009-03-23, 2 : 00 p.m.

* PLACE

APCTP Headquarters, Pohang

* ABSTRACT

In the Seebeck effect, the electric voltage is generated in a conductor placed in a temperature gradient. The efficiency of the effect is given by the density and the scattering of the conduction electrons in usual metals and semiconductors. Recently, the transition metal oxides have attracted much attention as thermo-electric materials. Since the Seebeck effect is due to the entropy carried by the electric current, the spin and orbital degrees of freedom of conducting electrons in the oxides may enhance the Seebeck effect [1]. In the first part of this presentation, the enhanced Seebeck effect is discussed in the transition metal oxides. In the second part, the spin-Seebeck effect is proposed [2], where the spin voltage, i.e., spin accumulation, is generated in a ferromagnetic metal placed in a temperature gradient. Then by utilizing the spin-detection method based on the spin-Hall effect, the spin voltage is converted to the electric voltage. The Spin-Seebeck effect is induced by a pure spin current, a flow of electron spin without electric charge current, and provides a variety of spin-electronics applications.
[1] Physics of Transition Metal Oxides, by S. Maekawa et al. (Springer, 2004)
[2] Observation of the Spin-Seebeck effect, by K. Uchida et al. (Nature 455,778 (2008))

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