Abstract
The spin–flop transition of acicular hematite nanoparticles of different size synthesized by chemical route and annealed at different temperatures has been investigated as a function of temperature. Both the Morin transition temperature (TM) and the spin-flop transition field (Hsf) have been found to increase for increasing particle size. However, the size dependence of Hsf(T=0) is faster than that observed for TM, indicating the occurrence of a modification of both the anisotropy and exchange fields induced by thermal treatments. By contrast, the increase of TM with increasing size should be mainly ascribed to the effect of microstructure on the sole anisotropy field.
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