The influence of dipolar interactions in a frozen ferrofluid consisting of maghemite particles has been studied by Mossbauer spectroscopy in the temperature range from 60 to 200 K. Four samples with volume concentrations ranging from 0.3 to 17.7 % have been investigated. The superparamagnetic blocking temperature decreases when increasing the volume concentration of maghemite particles, indicating that the relaxation time decreases with increasing interaction strength. These results are discussed in the light of computer simulations of the superparamagnetic relaxation time as a function of the dipolar interaction strength.
|Title of host publication||Proc. ICAME'95|
|Place of Publication||Bologna|
|Publication status||Published - 1996|
|Event||International Conference on the Applications of the Mössbauer Effect - Rimini, Italy|
Duration: 10 Sep 1995 → 16 Sep 1995
|Conference||International Conference on the Applications of the Mössbauer Effect|
|Period||10/09/1995 → 16/09/1995|