Title :
Composition effects in high density CoPtCr media
Author :
Doerner, Mary F. ; Yogi, Tadashi ; Parker, Dan S. ; Lambert, Steven ; Hermsmeier, Brent ; Allegranza, Oletta C. ; Nguyen, Thao
Author_Institution :
IBM Adv. Storage & Retrieval, San Jose, CA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The optimization of the CoPtCr alloy for use in high density longitudinal magnetic recording is discussed. Low noise media can be obtained with a combination of high Cr concentration (22 at.%) and high deposition temperature. The results are consistent with a Cr segregation mechanism that provides reduction of exchange coupling without the need for a voided microstructure. The Curie temperature decreases significantly at 25 at.% Cr preventing further increase in the Cr concentration. Pt is added to the alloy to increase coercivity with little effect on other recording properties
Keywords :
Curie temperature; chromium alloys; cobalt alloys; coercive force; exchange interactions (electron); ferromagnetic properties of substances; magnetic recording; magnetic thin films; magnetisation; platinum alloys; segregation; sputtered coatings; transmission electron microscope examination of materials; Cr segregation mechanism; Curie temperature; DC planar magnetron sputtering; TEM; coercivity; composition effect; exchange coupling; high density CoPtCr media; high density longitudinal magnetic recording; high deposition temperature; low noise media; optimization; saturation magnetisation; voided microstructure; Chromium alloys; Coercive force; Magnetic heads; Magnetic noise; Magnetic recording; Microstructure; Noise level; Noise reduction; Pulse measurements; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
