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arXiv · 1711.00237

Spin current noise of the spin Seebeck effect and spin pumping

M. Matsuo·Y. Ohnuma·T. Kato·S. Maekawa
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Abstract

We theoretically investigate the fluctuation of a pure spin current induced by the spin Seebeck effect and spin pumping in a normal metal (NM)/ferromagnet (FM) bilayer system. Starting with a simple FI--NM interface model with both spin-conserving and spin-non-conserving processes, we derive general expressions of the spin current and the spin-current noise at the interface within second-order perturbation of the FI--NM coupling strength, and estimate them for an yttrium iron garnet (YIG) --platinum interface. We show that the spin-current noise can be used to determine the effective spin carried by a magnon, modified by the spin-non-conserving process at the interface. In addition, we show that it provides information on the effective spin of a magnon, heating at the interface under spin pumping, and spin Hall angle of the NM.

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M. Matsuo, Y. Ohnuma, T. Kato, S. Maekawa. 2017-11-01. Spin current noise of the spin Seebeck effect and spin pumping. https://doi.org/10.1103/physrevlett.120.037201

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