The nuclear ferromagneticresonance of 6 Coin Fe has been detected by observing the effectof a rf field on the angular distribution of they radiation emitted by polarizedCo nucleiat temperaturesof about 0.03'K. At resonance,rf induced transitions partially randomize theBoltzmann distribution,which is set up by thelow temperatureandthe large hyperfinefieldfor Co in Fe, in the ' Co groundstate. Therandomizationhas a destructive effect on theangular distribution of the emitted y rays, whichcan be detected by observing the counting rateat a specific angle as a function of frequency.The enhancementof the rf amplitude in a ferromagnet~ was necessary to keep the rf powerat a sufficiently low level in order to avoid arapid warm-up of the sample.