Linear-response theory of spin Seebeck effect in ferromagnetic insulators

Abstract

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.

6 pages, 3 figures. Added references and revised argument on the length scales at the end of Sec. 3

References in corpus (5)

• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Realization of XNOR and NAND spin-wave logic gates
• Theory of magnon-driven spin Seebeck effect
• Gigantic enhancement of spin Seebeck effect by phonon drag

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