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Low-temperature magnetic properties and the crystallization behavior of FINEMET alloy

Ponpandian, N and Narayanasamy, A and Chattopadhyay, K and Raja, Manivel M and Ganesan, K and Chinnasamy, CN and Jeyadevan, B (2003) Low-temperature magnetic properties and the crystallization behavior of FINEMET alloy. In: Journal Of Applied Physics, 93 (10). pp. 6182-6187.

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We have synthesized FINEMET alloy by a melt spinning technique and studied in detail its crystallization behavior and low-temperature magnetic properties. The crystallization behavior is characterized by transmission electron microscopy and Mossbauer spectroscopy. At early stages bcc solid solution precipitates from the amorphous matrix. At later stages, they order to yield DO3 ordered Fe3Si coexisting with a small amount of Fe2B. The analysis of Mossbauer spectra supports this observation. The temperature dependence of the magnetization in the temperature range 10-300 K of the FINEMET alloy in its as-quenched state follows the relation M(T) = M-0(T) (1-B T-3/2-C T-5/2-...), which is indicative of the presence of spin wave excitations in the alloy. The value of the C/B ratio and the mean-square value of the range of exchange interaction [r(2]) are found to be characteristic of the noncrystalline ferromagnets. The small value obtained for the exchange stiffness constant D is an indication of the softening of the exchange interaction.

Item Type: Journal Article
Publication: Journal Of Applied Physics
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Nov 2009 06:36
Last Modified: 19 Sep 2010 04:55
URI: http://eprints.iisc.ac.in/id/eprint/17107

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