Electron paramagnetic resonance observations in powdered cerous magnesium nitrate

A SQUID magnetometer was used to observe electron paramagnetic resonance in dilute powdered CMN. Three separate checks of the data have shown it to be consistent with previous work. A value of 1.60*10^7 (sec-Oe)^-1 was obtained for the maximum gyromagnetic ratio for the electron dipoles in the powder, the change in magnetization on resonance was shown to depend linearly on the power at which the resonance is driven, and the relaxation rate of the GMN powder was shown to depend on a phonon bottleneck. The results demonstrate the applicability of SQUID magnetometry to electron resonance study.