Temperature dependence of perpendicular magnetic anisotropy in Fe/Pt compositionally modulated multilayer films.

Abstract

Temperature dependences of magnetization and magnetic anisotropy were investigated in Fe/Pt compositionally modulated multilayer films (CMF's) prepared by rf sputtering method. The magnitude of surface magnetic anisotropy K_s of Fe/Pt CMF's is nearly equal to that of Co/Pt CMF's at 77 K and room temperature. Absolute value of volume magnetic anisotropy K_V of Fe/Pt CMF's is about two times as large as that of Co/Pt CMF's. The K_s obtained from the CMF's with thick Fe layer thickness seems almost constant against temperature. However, the K_V decreases gradually with temperature increases in Fe/Pt CMF's. The relation between the saturation magnetization M_s (T) and the perpendicular magnetic anisotropy K_⊥ (T)a re discussed.