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Dynamically Tuning the Bias Field of Magnetic Bubble Modules

IP.com Disclosure Number: IPCOM000081195D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Terlep, KD: AUTHOR

Abstract

Fig. 1 shows a generalized approach for magnetically tuning the bias field of magnetic bubble modules. The method is applicable to magnetic dipole bias field structures, wherein all flux supplying magnets are oriented in a common direction. Fig. 2 shows an example of such a structure where a magnet 10 is located at each corner, and the magnetic flux is contained primarily within the gap region between the parallel, low-reluctance, permalloy plates 12 and 14.

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Dynamically Tuning the Bias Field of Magnetic Bubble Modules

Fig. 1 shows a generalized approach for magnetically tuning the bias field of magnetic bubble modules. The method is applicable to magnetic dipole bias field structures, wherein all flux supplying magnets are oriented in a common direction. Fig. 2 shows an example of such a structure where a magnet 10 is located at each corner, and the magnetic flux is contained primarily within the gap region between the parallel, low-reluctance, permalloy plates 12 and 14.

The method for nonmechanically tuning the bias field for completed magnetic bubble modules consists of:
1. Provide a permanent magnet assembly design which will always

yield initial field strengths in excess of those required.
2. Subsequent to module assembly using unmagnetized materials,

magnetize the total assembly, thus magnetizing each of the

component magnetic parts to saturation.
3. Using the feedback system shown in Fig. 1, detune the magnets

by incrementally varying the AC demagnetizing current

magnitude until the optimum performance is realized. This

achievement is detected by monitoring one or several module

operating functions and comparing

the performance to established criteria.

The method may be used to very accurately achieve the optimum magnetic bias field for individual modules and, at the same time, to provide magnetic stabilization to the bias structure.

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