Thermal stability of ME recording media by measuring time and temperature effects

Different metal evaporated (ME) media were compared to investigate the cause of the temperature dependence of coercivity for ME media. It was found that exchange coupling and the temperature dependence of coercivity near room temperature are separate issues. By measuring the time dependence of coerc...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1996-09, Vol.32 (5), p.3623-3625
Main Authors: Tao Pan, Spratt, G.W.D.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Coercive force
Crystallization
Grain size
Magnetic field measurement
Magnetometers
Temperature dependence
Temperature measurement
Thermal stability
Time measurement
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Summary:Different metal evaporated (ME) media were compared to investigate the cause of the temperature dependence of coercivity for ME media. It was found that exchange coupling and the temperature dependence of coercivity near room temperature are separate issues. By measuring the time dependence of coercivity, the crystalline anisotropy of Co was found to be the main cause of ME media's temperature dependence of coercivity. The switching volume for Hi8 ME medium was found to be extremely small, about 1100 nm/sup 3/, which indicates highly desirable low recording noise. Furthermore, by evaluating the value of K/sub u/V/K/sub B/T, ME media were found to be thermally stable.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.538710