MAGNETOMECHANICAL BEHAVIOR IN GO AND NO FE-3-PERCENT-SI ALLOYS

Magnetomechanical damping (MMD) and mechanical Barkhausen noise power (MBP) of NO and GO Fe-3%Si strips under torsional stress (frequency ap proximate to 1 Hz) are studied as a function of the major axis directi on with respect to the rolling direction (theta = 0 degrees, 23 degree s, 45 degrees, 55 degrees, 67 degrees, 90 degrees). For all orientatio ns, NO strips show a relatively high MMD while MBP is always small; fo r GO strips, only theta = 55 degrees gives significative magnetomechan ical effects showing the participation of 90 degrees domain walls whic h should perform large Barkhausen discontinuities. These magnetomechan ical effects are significantly influenced by the glass film on the GO strip surfaces.