Bubble domain transfer switches

G - Physics – 11 – C

Patent

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352/37.3

G11C 11/14 (2006.01) G11C 19/08 (2006.01)

Patent

CA 1124400

IMPROVED BUBBLE DOMAIN TRANSFER SWITCHES Abstract of the Disclosure These improved current controlled transfer switches are particu- larly useful for changing the propagation path of very small bubble domains without requiring large amounts of transfer current. The underlying prin- ciple is that the transfer operation occurs when the magnitude of the magnetic drive field used to move bubble domains has diminished to a small value, or is zero. This means that the magnetic field due to current in the switch does not have to overcome the effect of the drive field and therefore can be very small while still being effective. This is termed a "start/stop" operation and in one embodiment, current-assisted transfer is achieved by utilizing a change in the sequence of the magnetic drive field (generally an in-plane rotating field) at the time of transfer. In another embodiment, a continuous "three-quadrant" magnetic drive field is used instead of the customary 360° rotating drive field. This three- quadrant field cycle is also the normal cycle for bubble storage operations and bubble motion elsewhere in the magnetic circuit is not disturbed by the switching operation because all devices are designed to operate with only one type of drive field cycle, which is the three-quadrant cycle. Switches operating in accordance with these principles do not have to have a particular design; in fact, several different designs are illustrated.

300434

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