Anomalous Magnetic Behavior of an Iron-Rich Glass

The magnetic properties of a glass containing 40 wt% Fe2O3 have been investigated by Mössbauer effect and electron spin resonance techniques, and the results compared with theory. The glass is found to be superparamagnetic, and there is evidence that the magnetic phase is amorphous, consisting of antiferromagnetically ordered regions about 100 Å in dimension.