Abstract
This chapter begins with a discussion of the Seebeck effect discovered by T. J. Seebeck in the 1820s, which is described as the generation of an electric voltage as a result of a temperature gradient. This stands in contrast with the spin Seebeck effect (SSE), which stands for the generation of ‘spin voltage’ as a result of a temperature gradient. Spin voltage refers to the potential for electron spins, which drives a spin current, a flow of spin-angular momentum; when a conductor is attached to part of a magnet with a finite spin voltage, the spin voltage injects a spin current into the conductor. The SSE is of crucial importance in spintronics and spin caloritronics because it enables simple and versatile generation of spin currents from heat.
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