Browse Prior Art Database

Piezoresistive Bubble Domain Detector

IP.com Disclosure Number: IPCOM000080552D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Fang, FF: AUTHOR [+2]

Abstract

These piezoresistive detectors are used to sense magnetic bubble domains, using the magnetostriction of the magnetic bubble domain material. These detectors are compatible with semiconductor technology.

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 91% of the total text.

Page 1 of 2

Piezoresistive Bubble Domain Detector

These piezoresistive detectors are used to sense magnetic bubble domains, using the magnetostriction of the magnetic bubble domain material. These detectors are compatible with semiconductor technology.

A bubble domain material 10 has located in intimate contact therewith a piezoresistive material 12. Material 12 can be a semiconductor such as Si or Ge. These semiconductors change their electrical resistance when they are strained. The material 12 is electrically connected to a constant-current source 14, which produces a constant current 1 through piezoresistive element 12.

In operation, a bubble domain BD which passes beneath piezoresistive material 12 causes a change in the strain in the bubble domain material 10, by virtue of the magnetostrictive effect of the bubble material 10. This strain is transmitted to the detector (piezoresistive material) 12 and causes a change in its electrical resistance. The change in resistance of material 12 is then manifested as a voltage signal V(s), thereby indicating the presence of a magnetic bubble domain BD.

The sensitivity of this detector is in the same range as that of conventionally used magnetoresistive sensors. Additionally, higher strains can be achieved in garnet bubble domain materials, and operation below room temperature will increase the sensitivity of this detector. Gain or amplification of the signal can easily be achieved by using the piezo-resistive sensor 12 in a fiel...