Kyushu Institute of Technology, Fukuoka 804-0015, Japan.
Magnedesign Corporation, Nagoya 466-0059, Japan.
Sensors (Basel). 2023 Mar 27;23(7):3506. doi: 10.3390/s23073506.
The core of a Gigahertz Spin Rotation (GSR) sensor, a compact and highly sensitive magnetic sensor, is composed of Co-Fe-based amorphous magnetic wire with a diameter of 10 μm. Observations of the magnetic domain structure showed that this magnetic wire has unusual magnetic noise characteristics. Bamboo-shaped magnetic domains a few hundred micrometers in width were observed to form inside the wire, and smaller domains a few micrometers across were observed to form inside these larger domains. The magnetic domain pattern changed abruptly when an external magnetic field was applied to the wire. Herein is shown how these changes may be a source of magnetic noise in the wire.
千兆赫兹旋转磁强计（Gigahertz Spin Rotation，GSR）传感器的核心由直径为 10 微米的钴铁基非晶态磁性丝组成，这是一种结构紧凑且灵敏度非常高的磁强计传感器。对磁畴结构的观察表明，这种磁性丝具有异常的磁噪声特性。在丝内观察到宽度为几百微米的竹状磁畴，在这些较大的磁畴内还观察到几微米宽的较小磁畴。当在丝上施加外磁场时，磁畴图案会发生急剧变化。本文展示了这些变化如何成为丝中磁噪声的来源。
