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

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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.