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Magnetization and Mossbauer study of partially oxidized iron cluster films deposited on HOPG

Artikel i vetenskaplig tidskrift
Författare Nils Tarras-Wahlberg
S. Kamali
Mats Andersson
C. Johansson
Arne Rosen
Publicerad i Journal of Magnetism and Magnetic Materials
Volym 367
Sidor 40-46
ISSN 0304-8853
Publiceringsår 2014
Publicerad vid Institutionen för fysik (GU)
Sidor 40-46
Språk en
Länkar dx.doi.org/10.1016/j.jmmm.2014.04.0...
Ämnesord Nanoparticle Iron cluster, Thin film, Iron oxide, Mossbauer spectroscopy, Magnetization
Ämneskategorier Magnetism

Sammanfattning

Iron clusters produced in a laser vaporization source were deposited to form cluster assembled thin films with different thicknesses on highly oriented pyrolytic graphite substrates. The development of oxidation of the clusters with time, up to three years, was investigated by magnetic measurements using an alternating gradient magnetometer. Furthermore, to receive information about the oxidation states, clusters of 57Fe were studied using Mossbauer spectroscopy. The magnetic analysis shows a time evolution of the saturation magnetization, remanence, and coercivity, determined from the hysteresis curves characteristic of a progressing oxidation. The different thicknesses of the iron cluster films as well as a protective layer of vanadium influence the magnetic properties when the samples are subjected to oxidation with Lime. While the saturation magnetization and remanence decrease and reach half the initial values for almost all the samples after three years, the coercivity increases for all samples and is more substantial for the thickest sample with a vanadium protective layer. This value is three folded after three years. Furthermore, based on a core-shell model and using the saturation magnetization values we have been able to quantitatively calculate the amount of the increase of Fe-oxide as a function of time. The Mossbauer spectroscopy shows peaks corresponding to iron metal and maghemite.

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