Abstract
We have produced films of iron clusters in a laser vaporization source. The iron clusters were deposited on glass microslides and graphite substrates. The films -were analyzed with transmission electron microscopy (TEM), Mössbauer spectroscopy, magnetic measurements and atomic force microscopy (AFM). The TEM results show that the sizes of the deposited iron clusters are in the range from 2 nm to about 10 nm. From Mössbauer measurements we found that the particles undergo fast superparamagnetic relaxation at room temperature and become thermally blocked at lower temperatures. From hysteresis loops we obtained that the saturation magnetization of the films was in the range of bulk a-iron and the coercivity and remanence increase with decreasing temperature, typical for a system of mono-domain particles with a size distribution. The results from the AFM yield a cluster size in the same range as determined by TEM.
Published Version
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