In this paper, the dynamics of a magnetization undergoing a radiation-damping based feedback radio-frequency field is investigated both theoretically and experimentally. It is shown that due to the presence of relaxation the evolution equations predict the existence of self-sustained maser pulses. This phenomenon is a consequence of the competition between two different processes, namely, relaxation and a precession about a magnetization-dependent radio-frequency field. Experiments show the existence of periodic revivals of the free induction decay over unusually long periods of time, on the order of tens of seconds.
Self-sustained Maser oscillations of a large magnetization driven by a radiation damping-based electronic feedback
Daniel Abergel, Alain Louis-Joseph, Jean-Yves Lallemand; Self-sustained Maser oscillations of a large magnetization driven by a radiation damping-based electronic feedback. J. Chem. Phys. 22 April 2002; 116 (16): 7073–7080. https://doi.org/10.1063/1.1462583
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