Scanning spin probe based on magnonic vortex quantum cavities
- URL: http://arxiv.org/abs/2401.06549v1
- Date: Fri, 12 Jan 2024 12:53:49 GMT
- Title: Scanning spin probe based on magnonic vortex quantum cavities
- Authors: Carlos A. Gonz\'alez-Guti\'errez, David Garc\'ia-Pons, David Zueco,
and Mar\'ia Jos\'e Mart\'inez-P\'erez
- Abstract summary: We propose the realization of a nanoscale scanning electron paramagnetic resonance sensor using a vortex core in a thin-film disc.
The vortex core can be displaced by using external magnetic fields of a few mT, enabling EPR scanning microscopy with large spatial resolution.
Vortex nanocavities could also attain strong coupling to individual spin molecular qubits, with potential applications to mediate qubit-qubit interactions.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Performing nanoscale scanning electron paramagnetic resonance (EPR) requires
three essential ingredients. First, a static magnetic field together to field
gradients to Zeeman split the electronic energy levels with spatial resolution.
Second, a radiofrequency (rf) magnetic field capable of inducing spin
transitions. Finally, a sensitive detection method to quantify the energy
absorbed by spins. This is usually achieved by combining externally applied
magnetic fields with inductive coils or cavities, fluorescent defects or
scanning probes. Here, we {\color{black} theoretically propose the realization
of a EPR scanning sensor merging all three characteristics into a single
device}: the vortex core stabilized in ferromagnetic thin-film discs. On one
hand, the vortex ground state generates a significant static magnetic field and
field gradients. On the other hand, the precessional motion of the vortex core
around its equilibrium position produces a circularly polarized oscillating
magnetic field, which is enough to produce spin transitions. Finally, the
spin-magnon coupling broadens the vortex gyrotropic frequency, {\color{black}
suggesting} a direct measure of the presence of unpaired electrons. Moreover,
the vortex core can be displaced by simply using external magnetic fields of a
few mT, enabling EPR scanning microscopy with large spatial resolution. Our
{\color{black} numerical} simulations show that, by using low damping magnets,
it is {\color{black} theoretically} possible to detect single spins located on
the disc's surface. Vortex nanocavities could also attain strong coupling to
individual spin molecular qubits, with potential applications to mediate
qubit-qubit interactions or to implement qubit readout protocols.
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