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We examine a modified drift-diffusion formalism to describe spin transportnear an ultrathin magnet whose thickness is similar to or less than the spindephasing length. Most of the previous theories on spin torque assume thetransverse component of a injected spin current dephases perfectly thus arefully absorbed into the ferromagnet. However, in the state-of-art multilayersystems under consideration of recent studies, the thicknesses of ferromagnetsare on the order of or less than a nanometer, thus one cannot safely assume thespin dephasing to be perfect. To describe the effects of a finite dephasingrate, we adopt the concept of transmitted mixing conductance, whose applicationto the drift-diffusion formalism has been limited. For a concise description ofphysical consequences, we introduce an effective spin transparency.Interestingly, for an ultrathin magnet with a finite dephasing rate, the spintransparency can be even enhanced and there arises a non-negligible field-likespin-orbit torque even in the absence of the imaginary part of the spin mixingconductance. The effective spin transparency provides a simple extension of thedrift-diffusion formalism, which is accessible to experimentalists analyzingtheir results.

Spin transparency for an interface of an ultrathin magnet within the spin dephasing length