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Absence of spin superradiance in resonatorless magnets

✍ Scribed by V. I. Yukalov; E. P. Yukalova

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
238 KB
Volume
2
Category
Article
ISSN
1612-2011

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✦ Synopsis

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).

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