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Browse Prior Art Database

Bubble Sensor for Multiplex Applications

IP.com Disclosure Number: IPCOM000046932D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Kabelac, WJ: AUTHOR [+2]

Abstract

The domain structure in a thin-film magnetoresistive sensor for bubble detection is influenced by the geometry of the pads which allow electrical connection to be made to the sensor element. In order to achieve a symmetrical response to a rotating drive field, the sensor geometry should be symmetrical, particularly for multiplex applications. A possible solution is to design sensor elements with pads located at the ends of the sensor strip. The disadvantage is that the presence of a bubble expansion conductor usually requires that the overall length of the sensor be greater (and hence have higher resistance and lower sensitivity) than that of the equivalent sensor with electrical connection made to the side.

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Bubble Sensor for Multiplex Applications

The domain structure in a thin-film magnetoresistive sensor for bubble detection is influenced by the geometry of the pads which allow electrical connection to be made to the sensor element. In order to achieve a symmetrical response to a rotating drive field, the sensor geometry should be symmetrical, particularly for multiplex applications. A possible solution is to design sensor elements with pads located at the ends of the sensor strip. The disadvantage is that the presence of a bubble expansion conductor usually requires that the overall length of the sensor be greater (and hence have higher resistance and lower sensitivity) than that of the equivalent sensor with electrical connection made to the side. A bubble sensor for multiplex applications has a structure, as shown in the drawing, that provides a symmetrical response to a uniform rotating field. The sensor 1 has four pads A1, A2, B1 and B2. Electrical contact can be made to either pads A1 and A2 or to pads B1 and B2 depending upon the orientation of the detector. The magnetoresistive output would be similar in either case.

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