Effect of Pressure on the Giant Magnetoresistance of Fe/Cr Magnetic Superlattices

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The effect of pressure on the electrical resistance and the magnetoresistance of (Fe 30 Å/Cr 11 Å)₂₂ superlattices has been investigated at high pressures up to 16 kbar and high magnetic fields up to 50 kOe. It is found that the electrical resistivity ρ decreases with increasing pressure, having a rate of (1⁄ρ)(∂ρ⁄∂P)=−8.7×10⁻³ kbar⁻¹ at room temperature, and that the magnetoresistance (MR) ratio Δρ⁄ρ_s at 4.2 K is approximately constant below 8 kbar but decreases rapidly with increasing pressure above 8 kbar. The saturation field H_s increases with pressure.