Title :
Degradation mechanism of magnetic properties of Co-O film caused by residual gas
Author :
Iimura, M. ; Kubota, T. ; Hirano, H. ; Ogawa, Y. ; Mizumura, T.
Author_Institution :
Magnetic Media Dev. Center, Hitachi Maxell Ltd., Ibaraki, Japan
fDate :
9/1/1996 12:00:00 AM
Abstract :
The effects of the residual gas pressure on the magnetic properties of Co-O films were studied. The coercivity (Hc) and squareness ratio (Mr/Ms) decreased with increasing the residual gas pressure. Among the species, water vapor played a decisive role in degrading the magnetic properties. Analysis revealed that the degradation was caused by decrease in the anisotropy field (Hk) and increase in the easy axis angle (α) of the film. These changes in He and α by water vapor can be explained qualitatively
Keywords :
cobalt compounds; coercive force; environmental degradation; magnetic anisotropy; magnetic thin films; Co-O; Co-O film; anisotropy field; coercivity; degradation; easy axis angle; magnetic properties; residual gas; squareness ratio; water vapor; Degradation; Diffraction; Helium; Magnetic anisotropy; Magnetic films; Magnetic properties; Oxidation; Perpendicular magnetic anisotropy; Pressure measurement; Water;
Journal_Title :
Magnetics, IEEE Transactions on
