Magnetic Properties and Structure of Co/Pt Multilayered Films Evaporated on Heated Substrates

Abstract

Co/Pt multilayered films were evaporated on glass substrates that were heated up to 500°C. Perpendicular magnetic anisotropy K ⊥ was found to increase with the elevation of substrate temperature T s , reaching a maximum at T s =300°C. The surface anisotropy component also increased with elevating T s while the volume component hardly depended on T s . The coercivity of the perpendicular magnetization curve, H c⊥ , greatly increased with the elevation of T s , exceeding 4 kOe at T s =300 and 400°C. The layered structure was found to deteriorate considerably at T s =300°C, becoming indistinct at T s =400°C and higher. On the other hand, the (111) preferred orientation normal to the film plane became more pronounced with the elevation of T s . The average grain size < d g > was found to increase with the elevation of T s . It was also found that H c⊥ had a close relationship to < d g >, reaching a maximum at < d g >=250-300 Å.