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Torque Differential Magnetometry Using the qPlus Mode of a Quartz Tuning Fork

Lu Chen1,*, Fan Yu1, Ziji Xiang1, Tomoya Asaba1, Colin Tinsman1, Benjamin Lawson1, Paul M. Sass2, Weida Wu2, B. L. Kang3 et al.

Xianhui Chen3 and Lu Li1,†

  • 1Department of Physics, University of Michigan, Ann Arbor, 450 Church Street, Ann Arbor, Michigan 48108, USA
  • 2Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019, USA
  • 3Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China

  • *chelu@umich.edu
  • †luli@umich.edu
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Phys. Rev. Applied 9, 024005 – Published 7 February, 2018

DOI: https://doi.org/10.1103/PhysRevApplied.9.024005

Abstract

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.

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Outline

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Phys. Rev. Applied 9, 024005– Published 7 February, 2018
  • Received 17 May 2017
  • Revised 22 August 2017
Article part of CHORUS
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