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Bubble Domain Device Using Wave Propagation

IP.com Disclosure Number: IPCOM000083282D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR [+2]

Abstract

One of the major disadvantages of bubble domain devices using cylindrical, single-wall magnetic domains is the low-data rate achievable. The existing mode of operation for these devices uses the physical motion of the bubble domains, which are representative of binary information. The speed of these devices is limited by the transit time of the individual domains.

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Bubble Domain Device Using Wave Propagation

One of the major disadvantages of bubble domain devices using cylindrical, single-wall magnetic domains is the low-data rate achievable. The existing mode of operation for these devices uses the physical motion of the bubble domains, which are representative of binary information. The speed of these devices is limited by the transit time of the individual domains.

To improve data rate in bubble domain devices, a wave propagation mode is employed. Located on a magnetic medium 1 are permalloy guide rails a permalloy bar 3, and a sensing element 4, which can be a sensing element. Connected to sensing element 4 is constant-current source 5, which provides measuring current I through element 4. Also connected across element 4 is a voltage measuring device 6, which measures the sensing voltage V(s) developed across element 4.

Voltage sensing means 6 is connected to a generator and to timing circuits which are also connected to a set of coils 7, which will provide a rotating in-plane magnetic field H in response to signals in the coils. These coils surround platelet 1, and for convenience are represented by small coil 7. Bias field H(z) is normal to medium 1. and is used to stabilize the domain size.

To operate the device, bubble domains 8A-8E are put into the space between permalloy guide rails 2. In the static state, these domains are equally spaced having a spacing D sufficiently small that considerable interaction force ex...