Temperature dependence of spontaneous magnetization of ultrafine Fe particles in Fe-SiO2 granular solids
- 15 April 1987
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 61 (8) , 3308-3310
- https://doi.org/10.1063/1.338891
Abstract
We have studied the temperature dependence of the spontaneous magnetization of ultrafine Fe particles by measuring the initial susceptibility χ∼M2s (T)/kBT in the superparamagnetic state. It was found that Bloch’s law Ms=M0(1−BT3/2) gives good description at temperatures much higher than the blocking temperature of the Fe particles. The value B is substantially larger than that of the bulk Fe, due to magnetic surface effect and finite size effect. Size distribution and magnetostatic interaction between particles have also been studied.This publication has 5 references indexed in Scilit:
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