Abstract
The magnetoresistance of Fe/Cr magnetic multilayers (MMLs) on the 1st and the 2nd peaks has been measured at high pressure up to 3 GPa at low temperature in order to make clear the characteristics of the giant magnetoresistance (GMR) under high pressure. The GMRs of the MMLs on the 2nd peak are found to be enhanced strongly by applying pressure whereas those of 1st peak MMLs decrease with increasing pressure. The magnitude of GMR of the 2nd peak MMLs becomes about twice or more at 2 GPa compared with the value at ambient pressure. The large difference in the pressure dependences is explained by assuming a pressure-induced crossover in the interlayer exchange coupling from the biquadratic to the bilinear spin arrangements.
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