Small -dH/sub c//dT characteristics of CoPt granular and thin film recording media

The temperature dependence of the coercivity H/sub c/ was measured for CoPt-based thin film, CoPt-SiO/sub 2/ granular film and CoCr-based thin film recording media. All the samples showed a linear decrease in H/sub c/ with temperature, -dH/sub c//dT. It is found that CoPt-based media have smaller -d...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1998-07, Vol.34 (4), p.1600-1602
Main Authors: Kikitsu, A., Yusu, K., Ichihara, K., Tanaka, T.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Coercive force
Equations
Frequency
Magnetic anisotropy
Magnetic recording
Magnetization
Perpendicular magnetic anisotropy
Temperature dependence
Transistors
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Summary:The temperature dependence of the coercivity H/sub c/ was measured for CoPt-based thin film, CoPt-SiO/sub 2/ granular film and CoCr-based thin film recording media. All the samples showed a linear decrease in H/sub c/ with temperature, -dH/sub c//dT. It is found that CoPt-based media have smaller -dH/sub c//dT values than CoCr-based one. This means that CoPt-based media have good stability for archival and read/write characteristics at elevated temperatures. From a theoretical discussion, it is also found that CoPt-based thin film and granular media with small activating magnetic moment value are expected to have smaller recording coercivity than CoCr-based media.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.706628