A method is given for calculating the spin-diffusion constant in a ferromagnetic metal using a spin-transport equation. The result is that the diffusion constant in a ferromagnetic metal is reduced below that for a normal metal by the factor (1+ωₑₓ²Tₚ²)^-1, where ωₑₓ is the effective exchange frequency and Tₚ is the momentum relaxation time. The physical idea for the calculation was first thought of by L. L. Hirst, who has obtained the same results using an alternative method of calculation.
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Jerome I. Kaplan (1966) studied this question.
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