Influence of the rolling direction on magnetomechanical damping and mechanical Barkhausen noise of non-oriented Fe-3%Si alloy

We compare the behaviour of magnetomechanical damping (MMD) of vibrations a nd magnetomechanical noise (MN) when a cyclic torsional stress is applied t o NO Fe-3%Si rectangular strips. The torsion axis is parallel to the major axis of strips which shows five orientations (0 degrees, 22 degrees, 45 deg rees, 67 degrees, 90 degrees) in relation to the rolling direction, with di fferent magnetostriction values. NO strips show anisotropic behaviour of ma gnetomechanical effects. Like MMD, the high-frequency components of MN are due to the stress-induced jumps of 90 degrees domain walls. Additional stud ies show that the low-frequency component of noise varies similarly to that of the magnetic permeability and magnetic Barkhausen noise (BN). (C) 2000 Elsevier Science B.V. All rights reserved.