Circumferential single-mode domain uniform magnetization in metallic glass wires reduces magnetic noise of GMI sensor

The evolution of magnetic domains in metallic glass microwires (MGWs) plays a critical role in minimizing magnetic noise in giant magnetoimpedance (GMI) sensors. However, the underlying mechanisms of domain magnetization and reversal in MGWs remain poorly understood. Here, we report a discovered magnetic domain motion mechanism in MGWs: the single-mode uniform magnetization of circumferential domains. The increased atomic ordering promotes a more uniform alignment of magnetic moments, leading to the formation of circumferential magnetic domains. This suppresses the reversal of axial domains and lowers magnetic noise. These findings provide important insights for the design and development of low-noise GMI sensors.