J041042 Measurement of elastic stiffness of Co/Cu superlattice under magnetic field and at high temperatures

Abstract

Giant magnetoresistance (GMR) effect is a phenomenon that electric resistance changes by applying external magnetic field. The effect is used in magnetic recording media and has contributed the advancement of information society. In this study, we focus on relationship between elastic stiffness and GMR, and elastic stiffness of Co/Cu superlattice is measured by picosecond ultrasonics in a magnetic field and at high temperatures. As the result, we observed that Co/Cu superlattice showing larger magnetoresistance ratio shows larger temperature coefficient of elastic stiffness. Contribution of interfacial structure is discussed as a possible reason.