Enhanced Spin Relaxation in Nanocrystals of Different Geometries
Various coherent magneto-dynamical effects can lead to the phenomenon qualitatively similar to optical super-radiation (SR). To realize SR for spins, a sample should be placed in a passive resonance circuit that, in response to the magnetization motion, generates a feedback magnetic field common for all the spins of the system. The electromagnetic radiation emitted by an assembly of nano-entities (molecules, dots, grains) by way of the feedback effect establishes their coherence thus greatly reducing the duration and enhancing the intensity of the deexcitation pulse.
V.K. Henner et al., "Enhanced Spin Relaxation in Nanocrystals of Different Geometries", Solid State Phenomena, Vols. 168-169, pp. 408-411, 2011