DocumentCode :
844263
Title :
Effect of crystallographic orientation dispersion on media thermal stability and recording characteristics
Author :
Choe, G. ; Zheng, M. ; Johnson, K.E. ; Lee, K.J.
Author_Institution :
MMC Technol., San Jose, CA, USA
Volume :
38
Issue :
5
fYear :
2002
fDate :
9/1/2002 12:00:00 AM
Firstpage :
1955
Lastpage :
1957
Abstract :
We have studied thermal stability and recording characteristics of CoCrPtB alloy media with varying c axis anisotropy dispersion, preferred orientation (PO), and in-plane orientation ratio (OR) on both glass and NiP-plated Al substrates. With increasing in-plane c axis orientation and OR, improved recording performances such as lower pulsewidth, lower media transition noise, and lower dc noise are achieved. Thermal decay rate is primarily determined by Co anisotropy dispersion and in-plane OR for the same coercivity media. Media having a large out-of-plane c axis component exhibit a wide switching field distribution and have a high signal decay rate. The PW50 and dc noise of media with out-of-plane Co grains are very sensitive to changes in write field. On the other hand, highly oriented media having high OR are less sensitive to head writability variations and offer good thermal stability with excellent recording performance.
Keywords :
boron alloys; chromium alloys; cobalt alloys; coercive force; crystal orientation; magnetic anisotropy; magnetic recording noise; magnetic switching; platinum alloys; remanence; texture; thermal stability; Al; Co anisotropy dispersion; CoCrPtB; CoCrPtB alloy media; NiP-Al; NiP-plated Al substrates; PW50; c axis anisotropy dispersion; coercivity; crystallographic orientation dispersion; dc noise; glass substrates; head writability variations; highly oriented media; in-plane orientation ratio; media transition noise; out-of-plane Co grains; preferred orientation; pulsewidth; recording characteristics; signal decay rate; switching field distribution; thermal decay rate; thermal stability; write field change sensitivity; Aluminum alloys; Anisotropic magnetoresistance; Crystallography; Dispersion; Glass; Magnetic anisotropy; Magnetic recording; Perpendicular magnetic anisotropy; Substrates; Thermal stability;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2002.802790
Filename :
1042056
Link To Document :
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