Structure and magnetic properties of nano-sized HoFe₂O₄ material
by A. Jaafar, A. Al-Saie, M. Bououdina
International Journal of Nanoparticles (IJNP), Vol. 3, No. 2, 2010

Abstract: A mixture of Ho₂O₃ and Fe₂O₃ were mechanically alloyed followed by subsequent annealing to produce a single nanocrystalline HoFe₂O₄ phase. XRD patterns and magnetisation hysteresis curves were obtained for both the as-milled and annealed samples. XRD analysis indicates the formation of an initial amorphous phase in the as-milled powder. After annealing up to 1200°C, the material crystallises into nanosized (75 nm) monoferrite HoFe₂O₄ phase, accompanied by dramatic increment of magnetic properties. Moreover, the HoFe₂O₄ shows a ferromagnetic behaviour and a large hysteresis loop with Ms ≈ 72 emu/g, Hc ≈ 1.4 kOe and Mr ≈ 39 emu/g.

Online publication date: Wed, 25-Aug-2010

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