Spin superradiance by magnetic nanomolecules and nanoclusters

Abstract

Spin dynamics of assemblies of magnetic nanomolecules and nanoclusters can be made coherent by inserting the sample into a coil of a resonant electric circuit. Coherence is organized through the arising feedback magnetic field of the coil. The coupling of a magnetic sample with a resonant circuit induces fast spin relaxation and coherent spin radiation, that is, superradiance. We consider spin dynamics described by a realistic Hamiltonian, typical of magnetic nanomolecules and nanoclusters. The role of magnetic anisotropy is studied. A special attention is paid to geometric effects related to the mutual orientation of the magnetic sample and resonator coil.

Generation of coherent radiation by magnetization reversal in graphene

“…This edge is assumed to be directed along the axis x corresponding to the direction of the resonator coil. Such a geometry is taken because it guarantees the best coupling of the resonator with the spins of the sample [47,48]. The spins of the sample are prepared in a strongly nonequilibrium state, similarly to the setup employed in other magnetic materials [45][46][47][48][49][50].…”

“…Such a geometry is taken because it guarantees the best coupling of the resonator with the spins of the sample [47,48]. The spins of the sample are prepared in a strongly nonequilibrium state, similarly to the setup employed in other magnetic materials [45][46][47][48][49][50]. At the initial time, the defect spins are polarized downwards, with the total initial polarization e z (0) = −0.9.…”