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One Phase Magnetic Bubble Driving Scheme

IP.com Disclosure Number: IPCOM000075470D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Chang, W: AUTHOR [+2]

Abstract

This magnetic domain propagation array provides unidirectional control of the domain propagation, high-packing density, high-data rate and easy fabrication.

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One Phase Magnetic Bubble Driving Scheme

This magnetic domain propagation array provides unidirectional control of the domain propagation, high-packing density, high-data rate and easy fabrication.

A body of magnetic material 10, as shown in Fig. 1, has a conductive pattern 12 deposited thereon. The pattern 12 is such as to form a series of rectangular open-ended loops 16a, 16b, 16c and 16d. A pair of permalloy dots 14a, 14b, 14c and 14d is included in each loop 16a, 16b, 16c and 16d, respectively. Each pair of dots is equally spaced from the next adjacent pair of dots and offset from the center of the loop.

When a domain 18 is introduced by known techniques into the first loop 16a, it can be propagated along the pattern 12 by applying an alternating current to the pattern 12. Because of the offset pair of dots 14a, in loop 16a, the domain 18 will be located in a preferred position which is offset towards the dots 14a and away from the center of the loop 16a. When the applied current, to pattern 12, is such that during the first half-cycle, say for example, the positive half of the cycle, as shown by curve 19 in Fig. 2a, the magnetic field in the loops 16a and 16c is directed out of the upper surface of the material 10, as shown by the arrows 20, and the field in the loops 16b and 16d will be directed into the upper surface of the material 10, as shown by the arrows 22. The directional magnetic field, in loop 16a, will tend to push the domain 18 into the loop 16b...