Passive magnetic field sensors having magnetostrictive and piezoelectric materials

   
   

Passive solid-state magnetic sensors comprise a magnetostrictive material in contact with a piezoelectric material. The magnetostrictive material strains under the influence of an external magnetic field and imparts stress to the piezoelectric material to produce a detectable voltage signal indicative of the external field. Sensors have applications in rotor speed detection, electrical current measurements, magnetic imaging, magnetic field detection, read heads, and MRAM, for example.

Os sensores magnéticos solid-state passivos compreendem um material magnetostritor no contato com um material piezoelectric. As tensões materiais magnetostritoras sob a influência de um campo magnético externo e dão o stress ao material piezoelectric para produzir um sinal detectável da tensão indicativo do campo externo. Os sensores têm aplicações na deteção da velocidade do rotor, medidas atuais elétricas, imagem latente magnética, deteção do campo magnético, cabeças lidas, e MRAM, para o exemplo.

 
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