An all-electrical torque differential magnetometer operating under ambient conditions

Kamra, Akashdeep; Hoesslin, Stefan von; Roschewsky, Niklas; Lotze, Johannes; Schreier, Michael; Gross, Rudolf; Goennenwein, Sebastian T. B.; Huebl, Hans

doi:10.1140/epjb/e2015-60380-2

Cited by 5 publications

(12 citation statements)

References 20 publications

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“…1b and Methods) 30 . The benefits of repurposing the A-probe for resonant torsion magnetometry are threefold: the relatively large spring constant of the silicon cantilever (5 N m −1 30 ) allows us to extend ultrasensitive and dynamic cantilever magnetometry 31 – 36 to macroscopic sample sizes; placement of the sample on the silicon cantilever (rather than one leg of a quartz tuning fork) eliminates complications that arise from the center of mass motion of the tuning fork coupling to the resonance mode 37 , 38 ; and electrical read-out of the A-probe eliminates the need for optical detection of the resonant frequency, making setup relatively straightforward and more robust compared to previous approaches.…”

Section: Resultsmentioning

confidence: 99%

Resonant torsion magnetometry in anisotropic quantum materials

et al. 2018

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Unusual behavior in quantum materials commonly arises from their effective low-dimensional physics, reflecting the underlying anisotropy in the spin and charge degrees of freedom. Here we introduce the magnetotropic coefficient k = ∂2F/∂θ2, the second derivative of the free energy F with respect to the magnetic field orientation θ in the crystal. We show that the magnetotropic coefficient can be quantitatively determined from a shift in the resonant frequency of a commercially available atomic force microscopy cantilever under magnetic field. This detection method enables part per 100 million sensitivity and the ability to measure magnetic anisotropy in nanogram-scale samples, as demonstrated on the Weyl semimetal NbP. Measurement of the magnetotropic coefficient in the spin-liquid candidate RuCl3 highlights its sensitivity to anisotropic phase transitions and allows a quantitative comparison to other thermodynamic coefficients via the Ehrenfest relations.

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Section: Resultsmentioning

confidence: 99%

Resonant torsion magnetometry in anisotropic quantum materials

et al. 2018

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“…(28)]. Given that a sensitivity large enough to investigate magnetic nanoparticles via TDM has already been demonstrated [4], and the progress towards simpler and cheaper experimental setups [23], the calculations reported herein are expected to offer an impetus for further interest in this technique as a probe into magnetic properties of a system. …”

Section: Discussionmentioning

confidence: 89%

“…(1). This issue can be circumvented by relatively stiff oscillators which have higher elastic stiffness and frequency [20,23].…”

Section: High-field Limitmentioning

confidence: 99%

“…TDM thus offers similar advantages-namely less 1/f noise, low drift, and higher sensitivity at a given measurement rate [21]. Recent advances in using quartz tuning forks, instead of cantilever systems, for microscopy [20,22] and magnetometry [23,24] have made TDM particularly attractive due to the simplicity and wider operation range of the experimental setup. Hence, in this paper, we use the terms "cantilever" and "mechanical oscillator" (or simply "oscillator") interchangeably.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical model for torque differential magnetometry of single-domain magnets

et al. 2014

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We present a generic theoretical model for torque differential magnetometry (TDM)-an experimental method for determining the magnetic properties of a magnetic specimen by recording the resonance frequency of a mechanical oscillator, on which the magnetic specimen has been mounted, as a function of the applied magnetic field. The effective stiffness change, and hence the resonance frequency shift, of the oscillator due to the magnetic torque on the specimen is calculated, treating the magnetic specimen as a single magnetic domain. Our model can deal with an arbitrary magnetic free-energy density characterizing the specimen, as well as any relative orientation of the applied magnetic field, the specimen, and the oscillator. Our calculations agree well with published experimental data. The theoretical model presented here allows one to take full advantage of TDM as an efficient magnetometry method.

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“…Apart from the application in scanning probe microscopy, QTFs have a potential for the high-sensitivity magnetometry due to high quality factor Q (∼10 4 ) and high sensitivity [11]. Cantilever-based torque magnetometry with resolution better than 10 4 µ B was widely used to study small magnetization signal in magnetic thin layers [12] and individual nanotubes [13].…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Xiang

et al. 2018

Phys. Rev. Applied

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Quartz tuning fork is the key component of high-resolution atomic force microscope. Because of its high quality factor, quartz tuning fork can also be used for high sensitivity magnetometry. Herein, we developed a highly sensitive torque differential magnetometry using the qPlus-mode of a quartz tuning forks. The tuning fork is driven by an AC voltage and its deflection is measured by the resultant AC current. We observed a sharp resonance of the quartz tuning fork at low temperature down to 1.6 K. We calibrated our torque differential magnetometry by measuring the angular dependence of the hysteresis loop in single crystalline Fe0.25TaS2. Furthermore, we demonstrated the high sensitivity of the torque differential magnetometry by measuring the quantum oscillations of bismuth single crystal. The extracted Fermi surface cross sections are consistent with those of bismuth crystals.

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An all-electrical torque differential magnetometer operating under ambient conditions

Cited by 5 publications

References 20 publications

Resonant torsion magnetometry in anisotropic quantum materials

Resonant torsion magnetometry in anisotropic quantum materials

Theoretical model for torque differential magnetometry of single-domain magnets

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

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