A low-cost vibrating sample magnetometry based on audio components
A low-cost vibrating sample magnetometry based on audio components
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DOI：
10.1016/j.jmmm.2020.166560
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发表时间：
2020-05
影响因子：
2.7
通讯作者：
B. R. Sankhi;E. Turgut
中科院分区：
文献类型：
--
作者：
B. R. Sankhi;E. Turgut
在本文中，我们开发了一种使用声卡的低成本、高灵敏度的磁化特性测试仪，并将其灵敏度与商用测量技术进行了比较。首先，我们使用RLC电路测量声卡的频率相关响应，并将其与锁定放大器进行比较。然后，我们构建了一种简单而通用的测量仪器--基于音频元件的振动样品磁强计(VSM)，其中数据采集由声卡和商用锁定放大器完成。我们通过测量三种不同样品的磁滞回线来测试我们的磁测量：镍块、易平面各向异性的永磁合金薄膜和垂直磁各向异性的Co/Pt多层膜。分析了三种样品在不同振动频率下的磁化强度，比较了两种数据采集方法的灵敏度。尽管由于频率截止，声卡在低于20赫兹的振动频率下的表现略逊于锁定放大器，但在高达60赫兹的频率下，声卡提供的灵敏度大约是锁定放大器的七倍。结果表明，基于声卡的VSM在34.7 GHz的振动频率下具有高达2微动车组的灵敏度，可以适用于各种实验室和工业应用。
In this paper, we developed a low-cost, highly sensitive magnetization characterization instrument using a sound card and compared its sensitivity with commercially available measurement techniques. Firstly, we use an RLC circuit to measure the frequency-dependent response of the sound card and compare it with a lock-in amplifier. Then, we construct a simple but versatile measuring instrument, vibrating sample magnetometer (VSM) based on audio components, where data acquisition is performed by the sound card and the commercial lock-in amplifier. We test our magnetometry by measuring the magnetic hysteresis of three distinct samples: Nickel bulk piece, perm-alloy thin film with an easy-plane anisotropy, and Co/Pt multilayer with perpendicular magnetic anisotropy. We also analyze the magnetizations of three samples for different vibration frequencies and compare the sensitivities of two data acquisition methods. Although the sound card performs slightly worse than the lock-in amplifier at the vibration frequencies lower than 20 Hz due to the frequency cut-off, the sound card provides approximately seven times better sensitivity than the lock-in amplifier does at higher frequencies up to 60 Hz. We found that the sound card based VSM can have a sensitivity as high as 2 micro-emu at 34.7 Hz vibration frequency, which can be suitable for various laboratory and industrial applications.