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Mixing impurities A and B with opposite or similar spin asymmetries:the pre-concept of GMRspinExample: Ni + impurities A and B (Fert-Campbell, 1968, 1971)1st case2d caseα = ρα A > 1, α B < 1 ↓ /ρ ↑α A and α B > 1High mobility channel low ρspinspinspinρ AB >> ρ A + ρ Bρ AB ≈ ρ A + ρ BJ. de Physique 32, 1971
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