Magnetic Losses and Domain Wall Activities: A Study of Barkhausen Noise Under Rotational Magnetization

This study investigates the magnetic Barkhausen noise (MBN) in non-oriented electrical steel under rotational magnetization conditions, focusing on its application to improve the understanding of magnetic losses and the behavior of ferromagnetic domains. MBN serves as a powerful tool for characterizing domain wall dynamics, and its use under rotational magnetization offers new insights into energy losses in electromagnetic devices. We developed an experimental setup to measure MBN under different levels of flux density and to compare the results with conventional alternating magnetization. For the first time, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">MBN_energy</i>(<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i>) hysteresis loops were plotted under rotational magnetization, offering unique perspectives on domain wall activity and domain structure kinetics. Our findings indicate a significant reduction in domain wall motion beyond a threshold magnetic flux density under rotational conditions. The differences observed between classical hysteresis loops and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">MBN_energy</i>(<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i>) loops under both unidirectional and rotational magnetization clarify the specific contributions of rotational magnetization, as well as the distinct roles of 180° and 90° domain wall motions.