Title :
Barium ferrite thin films without a dead layer
Author :
Chen, Yingjian ; Rao, Maithri ; Laughlin, David E. ; Kryder, Mark H.
Author_Institution :
Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
A barium ferrite layer with low-Ba content was used as an underlayer for a high-Ba content barium ferrite thin film. During the post-deposition annealing, the underlayer which has a lower nucleation rate than the top layer prevented grains from nucleating in the interdiffused region at the interface with the substrate. As a result, the magnetic properties were dramatically improved as indicated by much higher coercivity squareness S* and narrower switching field distribution
Keywords :
annealing; barium compounds; chemical interdiffusion; coercive force; ferrites; magnetic hysteresis; magnetic switching; magnetic thin films; Ba content; BaFe12O19; coercivity squareness; ferrite layer; interdiffused region; nucleation rate; post-deposition annealing; switching field distribution; underlayer; Annealing; Atomic force microscopy; Atomic layer deposition; Barium; Crystallization; Ferrite films; Magnetic films; Magnetic properties; Perpendicular magnetic recording; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
