Newly developed SmCo₅thin film with perpendicular magnetic anisotropy

Abstract

A sputter-deposited SmCo5 thin film with perpendicular magnetic anisotropy has been developed. The Sm–Co film, composed of [Co (0.41 nm)/Sm (0.31 nm)]35, was prepared by sputtering on a Cu (100 nm)/glass substrate at various substrate temperatures. The coercivity was found to increase rapidly at 325–345°C and to be much greater in the direction perpendicular to the film surface than in the film plane. By using in-plane x-ray diffractometry, reflection peaks of the Sm–Co film deposited at 325–345°C were confirmed to originate from the SmCo5 phase, and the film showed a preferred orientation of the c-axis in the direction perpendicular to the film surface. The Co/Sm laminate structure deposited on the Cu seedlayer at an appropriate substrate temperature was found to be the key to promoting crystallization of the SmCo5 with its c-axis oriented perpendicular to the film surface.