Magnetoresistance of magnetic multilayers at high pressure

In the present work we report the effect of pressure on the giant magnetoresistance (GMR) of several magnetic multilayers (MML). First, we show the experimental results of the effect of pressure on the electrical resistance and magnetoresistance (MR) of Fe/Cr MML haying different thickness of Cr layers t(Cr). It is found that the GMR of the samples near the first peak (t(Cr) = 9.5 and 11 A) is affected strongly by applying pressure reflecting the unstable electronic structure but the effect of pressure on the MR of the sample between peaks (t(Cr) = 15.2 Angstrom) is very small. The saturation field H-S of Fe/Cr MML increases with pressure. These results are compared with those of other MMLs such as Fe/Cu and Co/Cu systems. Finally, the importance of the magnetic state in the paramagnetic layers or interfacial roughness is pointed out to understand the results in the present work.