Numerical micromagnetics is used to investigate the influence of the surface anisotropy on the magnetic behaviour of single domain spherical nanoparticles. Two kinds of surface anisotropy are considered: easy axis type (radial) and easy plane type (tangential). It is shown that the coercivity increases whereas the remanence decreases with the increase of the surface anisotropy and this tendency is more pronounced for radial surface anisotropy (K s < 0) than for tangential one (K s > 0). It is additionally shown that the enhancement of the coercivity depends on the particle size and is the strongest for the smallest particles.
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Nedelko et al. (2005) studied this question.
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