Structure and magnetic properties of amorphous and nanocrystalline Fe40Co40Cu0.5Zr9Al2Si4B4.5 alloys

Mitra, A and Kim, H Y and Louzguine, D V and Nishiyama, N and Shen, B and Inoue, A (2004) Structure and magnetic properties of amorphous and nanocrystalline Fe40Co40Cu0.5Zr9Al2Si4B4.5 alloys. Journal of Magnetism and Magnetic Materials, 278 (3). pp. 299-305.

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Crystallisation behaviour and magnetic properties of as-spun and annealed Fe40Co40Cu0.5Zr9Al2Si4B4.5 alloy have been studied. The annealing was performed at 873 K for 15 min. XRD and TEM studies shows the formation of nanocrystalline alpha-(Fe,Co)(SiAl) particles with 7.5+/-2nm in diameter dispersed in an amorphous matrix. The Curie temperature of the as-spun amorphous ribbon is 736 K. Saturation magnetisation of the annealed sample decreases at a rate of 0.5 emu/g/K in the measured temperature range of 300-1000 K. Excellent room temperature AC magnetic properties are achieved for the nanocrystalline sample. The low value of the imaginary part of the permeability and the high cut-off frequency (20 kHz) suggest that the eddy current contribution in the annealed materials is low. The coercivity of the annealed sample remains almost constant at 95 A/m up to the frequency of 20 kHz. High saturation magnetisation, high Curie temperature and excellent soft magnetic properties in the nanocrystalline state suggests that Fe40Co40Cu0.5Zr9Al2Si4B4.5 alloy is a strong candidate for high temperature magnetic application. (C) 2004 Elsevier B.V. All rights reserved.

Item Type:Article
Official URL/DOI:DOI: 10.1016/j.jmmm.2003.12.1315
Uncontrolled Keywords: nanocrystalline materials; Fe-Co-based material; magnetic properties; permeability; power loss
Divisions:Material Science and Technology
ID Code:3619
Deposited By:Sahu A K
Deposited On:04 Aug 2011 14:01
Last Modified:25 Jan 2012 10:45
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