Local probing of eddy current correlated with magnetic properties

Abstract

Recently, the development of long-range electric vehicles with effective electric motors has drawn considerable attention. The key to achieving such electric vehicles development is power saving, which has served as an essential motive for development of new magnetic materials. In this regard, further improvement of magnetic materials requires deep insight into the existence of eddy currents, which are primary contributors toward power loss in practical applications. Therefore, exploring the key effects of eddy currents on overall magnetic properties is essential. Here, we demonstrate clearly distinguished eddy current distributions being influenced by local magnetic properties via multidimensional magnetic force microscopy. Using our model systems, we explored the key role of an insulation layer and magnetic domains on eddy current dependent magnetic properties. In particular, we visualized the correlation between the eddy current and magnetic domain/domain wall. Therefore, our approach provides detailed characterization of eddy current, particularly related to the underlying contributions of local magnetic properties, offering crucial insights for improvement of electric motors.