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We investigated the effect of half-metal (HM) conductivity on the magnetoresistance (MR) of the pseudo spin-valve (PSV) structure. We derived a PSV MR model based on the spin transport theory of van Son et al. [Phys. Rev. Lett. 58, 2271 (1987)] and Rashba [Eur. Phys. J. B 29, 513 (2002)] to show that for HM intrinsic polarization (α) below a critical value, the PSV MR shows an anomalous behavior of decreasing with increasing HM resistivity. We attributed this to the competition between the HM and the ferromagnetic (FM) layers in contributing to the overall device MR, and derived the expression for critical α.

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