Abstract
Spin-dependent electron transport properties have been studied in magnetic multilayers by magnetic field tuning through the orientation transition from a ferromagnetic (FM) into an antiferromagnetic (AF) state. We find that in the [Fe/Cr] 10 multilayers the resistivity ρ S associated with the AF scattering varies in the temperature interval below 100 K as ρ S( T)= ρ S(0)− AT α with 0.5< α( H)⩽2. As T→0 K , the antiferromagnetic contribution ρ S saturates except for a narrow magnetic field region near H= H S 0, which tunes the AF transition temperature down to 0 K. For H>1.2 H S 0, the spin-dependent part in resistivity depends exponentially on temperature above 2 K, indicating a possible spin gap from localized antiferromagnetic correlations.
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