Sub-nano tesla magnetic imaging based on room-temperature magnetic flux sensors with vibrating sample magnetometry
Sub-nano tesla magnetic imaging based on room-temperature magnetic flux sensors with vibrating sample magnetometry
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DOI：
10.1063/1.4974016
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发表时间：
2017-01
期刊：
影响因子：
1.6
通讯作者：
Y. Adachi;D. Oyama
中科院分区：
文献类型：
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作者：
Y. Adachi;D. Oyama
我们使用商用磁阻传感器开发了一种弱磁荷分布的二维成像方法，该传感器的磁场分辨率为10 pT/Hz 1/2（10 Hz）。应用振动样品磁强计，对样品施加微小的机械振动，检测由振动频率调制的磁信号，可以抑制1/f噪声和环境低频带噪声的影响，在没有磁屏蔽的情况下获得微弱的磁荷分布。此外，当在振动的二次谐波频率下解调信号时，也期望空间分辨率的改善。本文介绍了用振动样品磁强计进行磁荷成像的初步方法及其结果。
We developed a two-dimensional imaging method for weak magnetic charge distribution using a commercially available magnetic impedance sensor whose magnetic field resolution is 10 pT/Hz1/2 at 10 Hz. When we applied the vibrating sample magnetometry, giving a minute mechanical vibration to the sample and detecting magnetic signals modulated by the vibration frequency, the effects of 1/f noise and the environmental low-frequency band noise were suppressed, and a weak magnetic charge distribution was obtained without magnetic shielding. Furthermore, improvement in the spatial resolution was also expected when the signals were demodulated at the second harmonic frequency of the vibration. In this paper, a preliminary magnetic charge imaging using the vibrating sample magnetometry and its results are demonstrated.