Surface anisotropy of a fine γ-Fe2O3 particle

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Abstract
We investigate the effects of surface anisotropy of a single‐domain γ‐Fe2O3 fine particle (length 3000 Å, aspect ratio 4.6:1) using micromagnetics and the finite element method. We add surface anisotropy energy, axially symmetric about the surface normal, to the total magnetic energy of the particle. We show that surface anisotropy of the appropriate sign enhances the coercivity. Further, the surface magnetization tends to be tangential to the surface and the magnetization reversal starts from the surface. Our simulation suggests that surface anisotropy might be an important mechanism for the coercivity enhancement in the surface‐modified iron oxides.

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