Torque Differential Magnetometry Using the qPlus Mode of a Quartz Tuning Fork
Torque Differential Magnetometry Using the qPlus Mode of a Quartz Tuning Fork
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DOI：
10.1103/physrevapplied.9.024005
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发表时间：
2018-02-07
影响因子：
4.6
通讯作者：
Li, Lu
中科院分区：
文献类型：
--
作者：
Chen, Lu;Yu, Fan;Li, Lu
石英音叉是高分辨原子力显微镜的关键部件。由于其高品质因数，石英音叉也可用于高灵敏度的磁力测量。我们开发了一种高灵敏度的扭矩差分磁力仪使用石英音叉的qPlus模式。音叉由交流电压驱动，其偏转通过产生的交流电流来测量。我们观察到石英音叉在1.6K的低温下的尖锐共振。我们校准我们的扭矩差分磁强计通过测量的角度依赖性的磁滞回线在单晶Fe 0.25TaS2。此外，我们通过测量铋单晶的量子振荡，证明了转矩微分磁力测量法的高灵敏度。提取的费米面截面与铋晶体的费米面截面一致。
A quartz tuning fork is the key component of high-resolution atomic force microscope. Because of its high quality factor, a quartz tuning fork can also be used for high-sensitivity magnetometry. We develop a highly sensitive torque differential magnetometry using the qPlus mode of a quartz tuning fork. The tuning fork is driven by an ac voltage, and its deflection is measured by the resultant ac current. We observe a sharp resonance of the quartz tuning fork at low temperatures down to 1.6 K. We calibrate our torque differential magnetometry by measuring the angular dependence of the hysteresis loop in single-crystal Fe0.25TaS2. Furthermore, we demonstrate the high sensitivity of the torque differential magnetometry by measuring the quantum oscillations of a bismuth single crystal. The extracted Fermi-surface cross sections are consistent with those of bismuth crystals.