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Perpendicular giant magnetoresistance of microstructured pillars in magnetic multilayers

We have fabricated pillar-like microstructures of Fe/Cr and Co/Cu magnetic multilayers and measured the giant magnetoresistance effect with the current perpendicular to the multilayer plane. The perpendicular giant magnetoresistance effect was determined as a function of temperature from 4 K to 300 K. For both Fe/Cr and Co/Cu multilayers we find, at low temperature, magnetoresistance effects of the order of 100%. The Fe/Cr pillars show a pronounced decrease with temperature of the magnetoresistance, while for Co/Cu the temperature dependence is much weaker. This different behaviour is caused by the different temperature dependence of the spin-dependent scattering; in the case of Co/Cu, we present results of a quantitative analysis of the temperature dependence using a resistance model of Fert and Campbell, originally proposed for magnetic alloys [1].