Abstract
The effect of thermal treatments on both the Morin transition and the spin flop field (H sf) of α-Fe 2O 3 acicular particles (major axis:(350 ± 50) nm; minor axis: (85 ± 15) nm.) has been investigated by means of magnetization vs temperature-magnetic field measurements. Both the Morin transition and the spin flop process have been observed only after an annealing treatment at 500 °C. Due to the finite size effect, the values of the Morin temperature and spin-flop field are significantly below the bulk value.
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