Superparamagnetic relaxation in alpha-Fe particles

Franz Bødker, Steen Mørup, Michael Stanley Pedersen, P. Svedlindh, G.T. Jonsson, J.L. Garcia-Palacios, F.J. Lazaro

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The superparamagnetic relaxation time of carbon-supported alpha-Fe particles with an average size of 3.0 Mm has been studied over a large temperature range by the use of Mossbauer spectroscopy combined with AC and DC magnetization measurements. It is found that the relaxation time varies with temperature in accordance with Ni el's expression, tau = tau(0) exp (KV/kT) with tau(0) = (1.0 +/- 0.5) x 10(-10) s and K = (1.2 +/- 0.2) x 10(5) J m(-3). (C) 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Pages (from-to)925-927
Publication statusPublished - 1998

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