NEW METHOD OF SENSING BUBBLE DOMAIN WITH MAGNETORESISTIVE ELEMENT

A sensitive detector for bubble domains using Permalloy magnetoresistive effect is described. In the conventional operation method of planar magnetoresistive elements they are arranged close to the circumference of a bubble domain, where the magnetic field runs parallel to the plane of elements. But even if the magnetic field is applied to the direction of angle phi against the film plane, the value of magnetoresistance change ratio DELTA R/R is, except near phi equals pi /2, similar to the one magnetized to the direction of the film plane, namely, phi equals 0. This experiment is explained from the fact that the specimen is magnetized by the horizontal component of the applied field. Abstract of Paper 59. 5, presented at the 1972 INTERMAG Conference, Kyoto, Japan, April 10-13.