Compositional microstructures of CoCr-alloy perpendicular magnetic recording media

Author

Hirayama, Y. ; Futamoto, M. ; Kimoto, K. ; Usami, K.

Author_Institution

Central Res. Lab., Hitachi Ltd., Kokubunji, Japan

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

3807

Lastpage

3809

Abstract

Compositional microstructures of CoCrTa and CoCrPt perpendicular magnetic recording media are investigated using a high resolution transmission electron microscope equipped with an imaging filter. In the CoCrTa film, clear Cr segregation at grain boundaries is recognizable. The Cr-enriched layer is analyzed to be paramagnetic phase of which Cr concentration is greater than 30 at%. In the case of CoCrPt film, Cr segregation is observed within the grains, and the Cr contents at grain boundaries are far lower than those measured for the CoCrTa film. The difference in the compositional microstructure is related to the difference in noise characteristics of CoCrTa and CoCrPt media

Keywords

chromium alloys; cobalt alloys; grain boundary segregation; magnetic recording noise; magnetic thin films; perpendicular magnetic recording; transmission electron microscopy; CoCr-alloy film; CoCrPt; CoCrTa; compositional microstructure; grain boundaries; high resolution transmission electron microscopy; imaging filter; noise characteristics; paramagnetic phase; perpendicular magnetic recording media; segregation; Chromium; Filters; Grain boundaries; High-resolution imaging; Image resolution; Magnetic force microscopy; Magnetic separation; Microstructure; Perpendicular magnetic recording; Transmission electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539179

Filename

539179