Title :
The dependence of compositional separation on film thickness for Co-Cr and Co-Cr-Ta magnetic recording media
Author :
Rogers, David J. ; Maeda, Yasushi ; Takei, Koji
Author_Institution :
NTT Basic Res. Labs., Atsugi, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
The dependence of the compositional distribution on film thickness was investigated for Co78Cr22 and Co86Cr12Ta2 films. Spin-echo NMR and preferential chemical etching revealed that the extent of compositional separation was greatest in thinner films and decreased during film growth for both Co-Cr and Co-Cr-Ta. Thinner films exhibited enhanced Ms and a higher density of smaller Co-enriched regions. Ta addition was observed to change the compositional distribution, promoting a finer pattern of Co-enriched regions
Keywords :
NMR spectroscopy; chromium alloys; cobalt alloys; etching; ferromagnetic materials; magnetic recording; magnetic thin films; segregation; spin echo (NMR); sputter deposition; tantalum alloys; Co-Cr; Co-Cr-Ta; Co-enriched regions; CoCr; CoCrTa; compositional separation; film growth; film thickness; magnetic recording media; preferential chemical etching; spin-echo NMR; sputter deposition; Chemicals; Etching; Frequency; Magnetic films; Magnetic recording; Magnetic separation; Microstructure; Nuclear magnetic resonance; Sputtering; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
