强垂直磁各向异性CoPt/AlN多层膜的反向磁化机理研究

Magnetic reversal mechanism in highly perpendicular anisotropic CoPt/AlN multilayer has been studied in the present work. The Sub/AlN(5 nm)/[CoPt(2 nm)/AlN(5 nm)]5 nano multilayer film shows a strong perpendicular magnetic anisotropy energy of 6.7×106 erg/cm3, which was revealed to originate from the magnetoelastic anisotropy and magnetic interface anisotropy in our previous work. In this work, the angle-dependent magnetic hysteresis loops of the nano layered film were measured by applying a magnetic field along different directions with respect to the film normal. The results demonstrate that the magnetic reversal of such highly perpendicular magnetic anisotropic layered film is occurred by the reversible magnetization rotation and the irreversible displacement of domain walls. The internal stress related coercive field is discussed by using the Kondorsky and Kersten model.