Magnetic properties and microstructure of FePt/BN nanocomposite films with perpendicular magnetic anisotropy

摘要

We have prepared L1_0-FePt/BN nanocomposite films by depositing the FePt/BN mutilayers on the MgO(100) substrates using magnetron sputtering followed by a postannealing process. We found the excellent perpendicular magnetic anisotropy of [FePt (2 nm)/BN (0.5 nm)]_(10) film after annealing at 700 ℃ for 1 h x-ray diffraction patterns also indicate an excellent (001) texture of the film. This film shows a perpendicular coercivity of 7.48 kOe and the ratio of the remnant magnetization M_r to the saturation one M_s of as high as 0.93. We also found the good epitaxial growth of FePt grains on the MgO(100) substrate by cross-section high resolution transmitting microscopy.