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Proceedings Paper

Ultrasoft FeAlSiBCuNb nanocomposites for GMI sensor applications
Author(s): Manh-Huong Phan; Hua-Xin Peng; Michael R. Wisnom; Seong-Cho Yu
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Paper Abstract

Fe73-xAlxSi14B8.5Cu1Nb3.5 (x = 0, 2) nanocomposite materials consisting of a nanocrystalline phase in an amorphous matrix were obtained by annealing their precursor amorphous ribbons, which were prepared by the melt-spinning technique, at different temperatures ranging between 350°C and 650°C for 45 min in vacuum. Investigation on their magnetic and magnetoimpedance properties indicates that the Al-containing sample (x = 2) possesses superior magnetic softness and giant magnetoimpedance (GMI) effect over the Al-free counterpart. This can be likely ascribed to the increased magnetic permeability, decreased coercive force and decreased resistivity. The increased magnetic permeability is resulted from a reduction in magnetocrystalline anisotropy and saturation magnetostriction. The correlations between magnetic softness, electrical properties and GMI behaviour is discussed in the light of the skin effect model. These results indicate that the Al-containing Fe-based nanocomposite material can be used for GMI sensor applications.

Paper Details

Date Published: 16 May 2005
PDF: 12 pages
Proc. SPIE 5763, Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (16 May 2005); doi: 10.1117/12.598436
Show Author Affiliations
Manh-Huong Phan, Bristol Univ. (United Kingdom)
Hua-Xin Peng, Bristol Univ. (United Kingdom)
Michael R. Wisnom, Bristol Univ. (United Kingdom)
Seong-Cho Yu, Chungbuk National Univ. (South Korea)

Published in SPIE Proceedings Vol. 5763:
Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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