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.
@article{arxiv.1711.00237,
title = {Spin current noise of the spin Seebeck effect and spin pumping},
author = {M. Matsuo and Y. Ohnuma and T. Kato and S. Maekawa},
journal= {arXiv preprint arXiv:1711.00237},
year = {2018}
}