We discuss the coherent behavior of a polarized, nuclear or electron, spin system for which the magnetic dipole radiation emitted in the radio-frequency region, has approximately quadratic dependence on the number of spins. An effective method of describing these phenomena is provided by computer simulation of a microscopic model of the spin system. Important aspects of this numeric simulation are described, together with a comparison with the theoretical predictions. The behavior of the transverse component of the magnetic moment, M+ (t), in super-radiant conditions is studied. In addition, the role of dipole-dipole interactions in super-radiation phenomena is investigated in detail. It is shown that some important features of super-radiation cannot be described with the Bloch equations.
C. L. Davis et al., "Spin-System Radio-Frequency Superradiation: A Phenomenological Study and Comparison with Numeric Simulations," Physical review B: Condensed matter and materials physics, vol. 72, no. 5, American Physical Society (APS), Jan 2005.
The definitive version is available at https://doi.org/10.1103/PhysRevB.72.054406
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