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Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Resonant torsion magnetometry in anisotropic quantum materials.

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Researchers developed a new method to measure magnetic anisotropy in quantum materials using atomic force microscopy. This technique offers high sensitivity for studying exotic magnetic behaviors in tiny samples.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Quantum materials exhibit unusual behaviors due to low-dimensional physics and anisotropy in spin and charge.
  • Understanding magnetic anisotropy is crucial for characterizing these materials.

Purpose of the Study:

  • Introduce a novel method to quantify magnetic anisotropy.
  • Demonstrate the method's sensitivity and applicability to nanoscale samples.

Main Methods:

  • Define and measure the magnetotropic coefficient (∂²F/∂θ²) using atomic force microscopy (AFM).
  • Utilize shifts in AFM cantilever resonant frequency under magnetic field for detection.
  • Achieve part per 100 million sensitivity.

Main Results:

  • Successfully measured magnetic anisotropy in the Weyl semimetal NbP using nanogram-scale samples.
  • Demonstrated the sensitivity of the magnetotropic coefficient to anisotropic phase transitions in the spin-liquid candidate RuCl₃.
  • Enabled quantitative comparison with thermodynamic coefficients via Ehrenfest relations.

Conclusions:

  • The developed AFM-based method provides a highly sensitive tool for measuring magnetic anisotropy in quantum materials.
  • This technique is applicable to small-scale samples and sensitive to phase transitions.
  • Offers a new pathway for characterizing exotic magnetic phenomena.