Magnetic recording medium and method for magnetic recording and reproduction
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United States of America Patent
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Jan 1, 1991
Grant Date -
N/A
app pub date -
Apr 8, 1988
filing date -
Apr 8, 1987
priority date (Note) -
Expired
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Abstract
A method for magnetic recording and reproduction comprising the steps of: (1) magnetically multiple-recording signals on a magnetic recording medium comprising a support having thereon an upper magnetic recording layer comprising barium ferrite having an increased coercive force at 60.degree. C. or more and a lower magnetic recording layer comprising at least one of chromium dioxide and Co-modified iron oxide, having a decreased coercive force at 60.degree. C. or more, disposed between said upper magnetic recording layer and said support; (2) heating said magnetic recording layers prior to reproduction due to a reproducing head; and (3) reproducing said magnetically recorded signal from said heated magnetic recording medium which is multiple-recorded.
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