Opto-magnetic recording medium
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United States of America Patent
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Mar 10, 1992
Grant Date -
N/A
app pub date -
Jun 27, 1990
filing date -
Jun 30, 1989
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Expired
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Abstract
An opto-magnetic recording medium having a perpendicularly magnetized film of a dual layer structure comprising a first layer composed of a rare earth-transition metal amorphous thin alloy film and a second layer composed of a rare earth-transition metal amorphous thin alloy film of a composition different from that of the first layer and having a lower curie point and a larger coercive force as compared with that of said first layer, and being capable of transferring bits recorded at a curie point in said second layer to the first layer by exchange-coupling force, said first layer being composed of a GdDyFeCo film in which the sublattice magnetization for transition metal is predominant at a room temperature, the second layer being composed of TbFeCo series film in which sublattice magnetization for rare earth is predominant at a room temperature, and the directions of predominant magnetization between the first layer and the second layer being opposed to each other.
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Patent Owner(s)
- SHARP KABUSHIKI KAISHA
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Ise, Tomokazu | Abiko, JP | 8 | 135 |
Takase, Tkeo | Kashiwa, JP | 1 | 30 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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