Abstract
We examine the effect of light-scattering fluctuations arising from thermal excitation of spin waves on optical guided waves propagating in a magnetic film. These thermal spin waves induce mode conversion in optical guided waves that manifests as optical noise during Faraday rotation. The equipartition theorem links this optical noise to that encountered in phase conjugation in an optical Kerr medium. Theory asserts that one channel for third-order optical nonlinearities of optical guided waves in a magnetic film is mediated by these thermal spin waves, and an expression for their contribution to this optical nonlinear Kerr coefficient is derived.
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