We formulate a linear response theory of the spin Seebeck effect, i.e., a spin voltage generation from heat current flowing in a ferromagnet. Our approach focuses on the collective magnetic excitation of spins, i.e., magnons. We show that the linear-response formulation provides us with a qualitative as well as quantitative understanding of the spin Seebeck effect observed in a prototypical magnet, yttrium iron garnet.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Mar 11 2011
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics