It is shown that crystals of molecular nanomagnets exhibit enhanced magnetic relaxation when placed inside a resonant cavity. Strong dependence of the magnetization curve on the geometry of the cavity has been observed, providing evidence of the coherent microwave radiation by the crystals. A similar dependence has been found for a crystal placed between Fabry-Perot superconducting mirrors. These observations open the possibility of building a nanomagnetic microwave laser pumped by the magnetic field.
@article{arxiv.cond-mat/0210340,
title = {Quantum dynamics of crystals of molecular nanomagnets inside a resonant cavity},
author = {J. Tejada and E. M. Chudnovsky and R. Amigo and J. M. Hernandez},
journal= {arXiv preprint arXiv:cond-mat/0210340},
year = {2009}
}