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Resonant photon absorption and hole burning in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cr</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow></mml:math>antiferromagnetic rings
Magnetization measurements on a crystal of ${\mathrm{Cr}}_{7}\mathrm{Ni}$ antiferromagnetic rings are presented. Irradiation with microwaves at frequencies between 1 and $10\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$ leads to observation of very narrow Gaussian resonant photon absorption lines which are mainly broadened by hyperfine interactions. The relaxation of magnetization after a nanosecond RF pulse is dominated by …