Magnetic recording medium and method of making the same
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United States of America Patent
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Mar 20, 2001
Grant Date -
N/A
app pub date -
Feb 4, 1999
filing date -
Jun 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording medium, and methods of making and reading the same, including on at least a portion of a substrate an irreversible recording layer which contains an irreversible recording material undergoing an irreversible change of saturation magnetization upon heating. The invention involves the steps of previously heating the irreversible recording layer to form an initial heated region in which a plurality of heated bars whose saturation magnetization has been irreversibly changed are arrayed in a bar code pattern, and converting unheated bars disposed between the heated bars into a heated state for changing the array pattern of heated bars, thereby recording the information.
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