A magnetic bubble detector using the principles of magneto‐striction and piezoelectricity has been constructed and tested. It has higher signal to noise ratio than conventional detectors since it does not require any problems associated with currents flowing in thin conductors. A simplified analysis shows that this device is capable of outputs of tens of millivolts with presently developed materials. An experimental device produced an output 1.2 millivolts from a simulated bubble in orthoferrite material. The principle of operation of the device is that of electrocmechanical transformer. The field of a bubble causes a strain in a magnetostrictive overlay. This strain is transferred to a piezoelectric crystalline film which produces an electrical ouput at high electrical impedance.

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