Open AccessAbsence of spin superradiance in resonatorless magnets
Author(s) -
Yukalov V. I.,
Yukalova E. P.
Publication year - 2005
Publication title -
laser physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 72
eISSN - 1612-202X
pISSN - 1612-2011
DOI - 10.1002/lapl.200410170
Subject(s) - superradiance , physics , dipole , magnet , condensed matter physics , spin engineering , radiation , anisotropy , magnetic dipole , spin polarization , quantum , spin (aerodynamics) , quantum electrodynamics , laser , quantum mechanics , electron , thermodynamics
A spin system is considered with a Hamiltonian typical of molecular magnets, having dipole‐dipole interactions and a single‐site magnetic anisotropy. In addition, spin interactions through the common radiation field are included. A fully quantum‐mechanical derivation of the collective radiation rate is presented. An effective narrowing of the dipole‐dipole attenuation, due to high spin polarization is taken into account. The influence of the radiation rate on spin dynamics is carefully analysed. It is shown that this influence is completely negligible. No noticeable collective effects, such as superradiance, can appear in molecular magnets, being caused by electromagnetic spin radiation. Spin superradiance can arise in molecular magnets only when these are coupled to a resonant electric circuit, as has been suggested earlier by one of the authors in Laser Phys. 12 , 1089 (2002). (© 2005 by Astro, Ltd. Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)