Abstract
The influence of particle interactions on the superparamagnetic relaxation time has been studied by Mössbauer spectroscopy in samples of maghemite (y-) with different particle sizes and particle separations. it is found that the relaxation time decreases with decreasing particle interactions. A new model for the influence of interactions on the superparamagetic relaxation has been derived and it is shown that this model can explain the observations.
- Received 17 December 1993
DOI:https://doi.org/10.1103/PhysRevLett.72.3278
©1994 American Physical Society