Magnetomechanical Damping in Magnetized Nickel

摘要

The magnetostrictive metals exhibit a specific mechanism of elastic energy dissipation during mechanical oscillations that provide large contributions to the internal friction (Q~(-1)). Within the low frequency (Hz range) both strain amplitude and magnetic polarization, Q~(-1). Within the low frequency (Hz range) both strain amplitude and magnetic polarization, Q~(-1) maxima were observed when a stress-relieved Ni tubular layer was subjected to longitudinal DC magnetic field. A phenomenological model based on a random profile potential function associated to the motion of the Bloch walls was developed in order to express qualitatively the relative energy loss, leading to results in agreement with the experimental data.