Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1515640 | Journal of Physics and Chemistry of Solids | 2014 | 4 Pages |
Abstract
Magnetic reversal mechanism of the Sub/AlN5Â nm/[CoPt2Â nm/AlN5Â nm]5 nano multilayer film, which shows strong perpendicular magnetic anisotropy (Ku=6.7Ã106Â erg/cm3), has been studied. The angle-dependent magnetic hysteresis loops of this highly perpendicular anisotropic CoPt/AlN multilayer film were measured in the present work, applying a magnetic field along different angles Ï with respect to the film normal. It demonstrates that the magnetic reversal of the CoPt ultrathin layers in the CoPt/AlN multilayer film is occurred by the reversible magnetization rotation and the irreversible displacement of domain walls. The Ï-dependent part of coercive field is resulted from the internal stress according to the Kondorsky and Kersten model. The Ï-independent part of coercive field implies some random and isotropy pinning centers (e.g., vacancies, dislocations, grain boundaries) in the ultrathin CoPt layers. Our work is useful for coercivity control of metal/ceramics layered structures, in particular the perpendicular magnetic tunneling junctions.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Youxing Yu, Lei Wang, Ji Shi, Yoshio Nakamura,