Browse Prior Art Database

Magnetic Bubble Thermal Compensation

IP.com Disclosure Number: IPCOM000077967D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Bosch, LJ: AUTHOR [+4]

Abstract

By use of a thermocouple and heater to sense and maintain a minimum temperature in a bubble domain package, the bubble diameter is maintained and, therefore, package design to mil specifications is achieved.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Magnetic Bubble Thermal Compensation

By use of a thermocouple and heater to sense and maintain a minimum temperature in a bubble domain package, the bubble diameter is maintained and, therefore, package design to mil specifications is achieved.

Specifically, the package design includes a thermocouple to sense the temperature of a lower permalloy plate and a heating element on an upper permalloy plate, as illustrated above. The heating element may be activated at temperatures below approximately 60 degrees C. The heat is then conducted through permanent magnet blocks to the lower permalloy plate, allowing for a balanced thermal environment. Above the cutoff point of the heating element, the magnetic bias is compensated for in the tracking ability of the magnetic design.

As an alternative, two sets of temperature sensitive magnets could be employed. One set designed to track from a lower limit of temperature to an intermediate temperature, and the other set to track from the intermediate temperature to an upper limit temperature.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]