Structure and soft magnetic properties of Finemet alloys

Manivel, Raja M and Chattopadhyay, K and Majumdar, B and Narayanasamy, A (2000) Structure and soft magnetic properties of Finemet alloys. In: Journal of Alloys and Compounds, 297 (1-2). pp. 199-205.

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Abstract

The soft magnetic properties of $Fe_{73.5}Cu_1Nb_3Si_{13.5}B_9$ (Finemet) alloys prepared by mechanical alloying were studied using various experimental techniques including Mossbauer spectroscopy. The study includes the influence of the milling atmosphere. The results are compared with mechanically alloyed Fe-Si alloys as well as with melt-spun Finemet alloys. The coercivity of the mechanically alloyed powder is much larger than that of the melt-spun ribbons, though the saturation magnetisation is the same. This is ascribed to the absence of a grain boundary amorphous ferromagnetic phase resulting in a weakening of the exchange coupling between the nanograins. This study suggests that the interfacial component in Finemet alloys plays a crucial role in achieving good soft magnetic properties. The critical grain size for single domain particle was found to be 10 nm. For very small grain sizes, the existence of superparamagnetism was also studied using Fe-57 Mossbauer spectroscopy

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Nanostructured alloys;Finemet;Soft magnetic materials;Critical grain size;Mossbauer spectroscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Sep 2006
Last Modified:	19 Sep 2010 04:30
URI:	http://eprints.iisc.ac.in/id/eprint/8173

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