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Magnetic Ink Bubble Access Technique

IP.com Disclosure Number: IPCOM000084903D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

DeLuca, JC: AUTHOR [+2]

Abstract

In a bubble domain lattice file, as shown in Fig. 1, bubble domains are moved back and forth in the direction of the horizontal arrows until they are brought to an access channel. When in the access channel, the domains are forced along a direction transverse to their direction of previous motion so that they can be removed from the lattice for readout. The possibility exists that some of the bubble domains may get out of order when they are being accessed in this manner. This type of disordering is shown in Fig. 2.

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Magnetic Ink Bubble Access Technique

In a bubble domain lattice file, as shown in Fig. 1, bubble domains are moved back and forth in the direction of the horizontal arrows until they are brought to an access channel. When in the access channel, the domains are forced along a direction transverse to their direction of previous motion so that they can be removed from the lattice for readout. The possibility exists that some of the bubble domains may get out of order when they are being accessed in this manner. This type of disordering is shown in Fig. 2.

It is proposed to use magnetic ink to define guides for horizontal and vertical movement of the bubble domains, in order to eliminate any type of disordering which may occur during accessing. Laser heating, or any other technique, is used to create a domain stripe structure as illustrated in Fig. 3. This stripe structure consists of horizontal stripes and a vertical stripe which is at an angle of 60 degrees from the horizontal direction.

After this stripe pattern has been created, magnetic ink is applied to the surface of the bubble domain material. The ink will adhere to the boundaries of the stripes and will dry in a pattern which reproduces the stripe pattern.

After this, the stripes are removed and the magnetic poles of the ink will act to create guide channels for bubble domain motion. The horizontal stripes of magnetic ink serve to stabilize horizontal translational motion of the bubble lattice, and the verti...