AC field-induced rotation of magnetostrictive wires: operating principle for field positioning microrotor sensors

The effect of a DC magnetic field on the rotation of Fe/sub 77.6/Si/sub 7.5/B/sub 15/ and Co/sub 75/Si/sub 10/B/sub 15/ amorphous wires under an axially applied AC field is investigated. The rotation frequency mainly decreases monotonically with increasing the DC field, Experimental results are exploited to propose a new family of field positioning microrotor sensors.