Abstract
The characteristics of acoustic emission generated during magnetization of typical ferromagnetic materials (steel, nickel, and cobalt) in alternating magnetic field of 50 Hz were investigated. Acoustic emission parameters measured were root‐mean‐square voltage, frequency spectrum, and waveform. The data were taken as a function of stress, magnetic field strength, and annealing time. It became clear that the magnitudes of acoustic emission during magnetization of steel and nickel were strongly dependent on stress and the features of these stress dependencies changed with magnetic field strength. It was found that the magnitude of acoustic emission during magnetization of cobalt was much smaller than those of steel and nickel. This experimental result and the theoretical calculation of elastic energy emitted by domain wall motion show that the motion of 90° domain wall is the most probable source for the acoustic emission during magnetization of ferromagnetic materials.
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