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US 4,745,578 AGranted
Magnetic bubble memory device
AssigneeHitachi, Ltd.
InventorsTeruaki Takeuchi, Naoki Kodama, Masatoshi Takeshita, Takashi Toyooka, Ryo Suzuki
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Abstract
A magnetic bubble memory device comprises contiguous-disk ion-implanted magnetic bubble propagation tracks formed by implanting selectively ions in a magnetic layer which can hold magnetic bubbles. At least one of the disks which form the ion-implanted bubble tracks and each of which may have a circular or square shape, is configured to include a combination of arcs of circles having different curvatures or a combination of sides of squares having different sizes.
Claims6
A magnetic bubble memory device comprising:
- minor loop means for storing information therein and including ion-implanted magnetic bubble propagation track means formed by implanting selectively ions in a magnetic layer which can hold magnetic bubbles therein, said track means including a first bubble propagation pattern having a small period and a second bubble propagation pattern having a great period, said first and second bubble propagation patterns being connected in a straight propagation track of said track means so that a tip of the pattern unit of said first bubble propagation pattern is contiguous to a tip of the pattern unit of said second bubble propagation pattern;
- major line means or major loop means for reading and writing information;
- and
- connecting means between said minor loop means and said major line means or said major loop means.
1 more element
A magnetic bubble memory device comprising;
- a major line means or major loop means made of permalloy;
- and
- minor loop means each including a magnetic bubble propagation pattern made of permalloy and an ion-implanted magnetic bubble propagation track which has a first bubble propagation pattern having a small period and a second bubble propagation pattern having a great period, said first and second bubble propagation patterns being connected in a straight propagation track of said ion-implanted magnetic bubble propagation track so that a tip of the pattern unit of said first bubble propagation pattern is contiguous to a tip of the pattern unit of said second bubble propagation pattern.
Dependencies are inferred from the claim text.