Image rotating diffraction grating
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United States of America Patent
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Aug 16, 1983
Grant Date -
N/A
app pub date -
Dec 18, 1980
filing date -
Dec 18, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is an apparatus for and a method of establishing the domain walls within a stripe-domain supporting magnetizable film in a radially directed orientation, the separation of which is proportional to the distance from the center of the diffraction grating. The apparatus includes means for coupling to the stripe-domain supporting magnetizable film an orienting field that is directed orthogonal to the plane of the film but whose intensity from the center of the field source is inversely proportional to the distance from the center of the field source and further including means for coupling to said film an AC tickle field of significant to decreasing to zero amplitude for overcoming the hysteresis of the film.
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