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

Abstract

We have prepared L10-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(2nm)∕BN(0.5nm)]10 film after annealing at 700°C for 1h x-ray diffraction patterns also indicate an excellent (001) texture of the film. This film shows a perpendicular coercivity of 7.48kOe and the ratio of the remnant magnetization Mr to the saturation one MS 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.