Effect of Pressure on the Spin-Dependence of Electrical Resistivity in Fe/Cr Magnetic Multilayers

概要

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The electrical resistivities of Fe/Cr magnetic multilayers have been measured at a high pressure and magnetic field. The electrical resistivity shows a large decrease by applying a magnetic field, indicating giant magnetoresistance (GMR). GMR decreases but the saturation field increases with increasing pressure. The spin-dependence of electrical resistivities due to the scattering of conduction electrons with spins parallel ($\rho_{+}$) and antiparallel ($\rho_{-}$) to the Fe layer magnetization are extracted. The pressure dependence of $\rho_{+}$ is greater than that of $\rho_{-}$. The origins of the pressure dependence of $\rho_{+}$ and $\rho_{-}$ are discussed on the basis of theoretical model, and the large pressure coefficients for $\rho_{+}$ and $\rho_{-}$ are suggested to be mainly due to a change in the random exchange potential at interfaces. A small minimum in the temperature-dependence of resistivity is induced by applying pressure. $\rho_{+}$ decreases but $\rho_{-}$ increases with increasing temperature up to 40 K. The anomalous temperature-dependence of resistivities is discussed in connection with a Kondo-like effect.
2010-05-15