Abstract
Abstract Ultrafine magnetic particles have properties which are significantly different from those of larger crystals. Mossbauer spectroscopy is very sensitive to these special properties of ultrasmall particles. Studies of particles in the superparamagnetic state allow determination of the particle size and the magnetic anisotropy energy constant. A strong magnetic interaction between the particles may result in superferromagnetism, i.e. ordering of the magnetic moments of particles which would be superparamagnetic if they were non—interacting. Furthermore, because a large fraction of the atoms in very small particles are in the surface layer, Mossbauer spectroscopy can be applied for studies of surface magnetism in ultrafine particles.
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