T0301-1-2 Co/Cu超格子の特異な弾性特性([T0301-1]金属ナノ材料の創製と展開(1))

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  • T0301-1-2 Anomalous elastic property of a Co/Cu superlattice

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Out-of-plane elastic stiffness of Co/Cu superlattices with different Cu thicknesses is determined by picosecond ultrasounds method and x-ray reflectivity analysis, and relationship between the stiffness and the interfacial structure is discussed. Considering the simple rule of mixture, macroscopic elastic stiffness of a Co/Cu superlattice monotonically changes as the thickness of a Cu layer increases. However, determined elastic stiffness showed an oscillating behavior, the period of about 10 A, which was similar to the reported Cu thickness dependence of giant magnetoresistance. Out-of-plane strain of Co/Cu superlattices also showed an oscillation behavior, and we observed that interfacial strain contributes on the stiffness.

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