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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Scanning Spin Probe Based on Magnonic Vortex Quantum Cavities.

Carlos A González-Gutiérrez1,2,3, David García-Pons1, David Zueco1

  • 1Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza ES-50009, Spain.

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Summary
This summary is machine-generated.

This study proposes a novel nanoscale scanning electron paramagnetic resonance (EPR) sensor using ferromagnetic vortex cores. This device integrates magnetic fields, radio frequency fields, and sensitive detection for single-spin imaging.

Keywords:
electron paramagnetic resonance imagingmagnetic sensormagnetic vortexquantum magnonicsquantum sensing

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Area of Science:

  • Condensed Matter Physics
  • Quantum Sensing
  • Nanotechnology

Background:

  • Nanoscale electron paramagnetic resonance (EPR) requires static magnetic fields, field gradients, radio frequency (rf) fields, and sensitive detection.
  • Current methods often involve complex setups with external components like coils or scanning probes.

Purpose of the Study:

  • To theoretically propose a single-device EPR scanning sensor.
  • To leverage the unique properties of magnetic vortex cores for nanoscale EPR.

Main Methods:

  • Theoretical modeling and numerical simulations.
  • Utilizing the static magnetic field and gradients from a vortex core ground state.
  • Employing the precessional motion of the vortex core to generate rf magnetic fields.
  • Investigating spin-magnon coupling for detection.

Main Results:

  • The proposed vortex core sensor integrates all necessary components for EPR.
  • Simulations indicate the potential for detecting single spins on the surface of low-damping magnets.
  • Vortex nanocavities show promise for coupling with molecular qubits.

Conclusions:

  • A single-device nanoscale EPR sensor based on ferromagnetic vortex cores is theoretically feasible.
  • This approach offers potential for high-resolution EPR microscopy and quantum information processing applications.