Spin superradiance by magnetic nanomolecules and nanoclusters

[摘要] 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.

[发布机构] Bogolubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna; 141980, Russia^1;Department of Physics, Perm State University, Perm; 614190, Russia^2;Department of Physics, University of Louisville, Louisville; KY; 40292, United States^3;Laboratory of Information Technologies, Joint Institute for Nuclear Research, Dubna; 141980, Russia^4

[关键词] Geometric effects;Magnetic samples;Mutual orientation;Nano-molecules;Spin relaxation