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

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

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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
Online Access:Get full text
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Summary:The temperature dependence of the coercivity H(c) was measured for CoPt-based thin film, CoPt-SiO(2) granular film and CoCr-based thin film recording media. All the samples showed a linear decrease in H(c) with temperature, -dH(c)/dT. It is found that CoPt-based media have smaller -dH(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
DOI:10.1109/20.706628