Large enhancement of GMI effect in polymer composites containing Co-based ferromagnetic microwires

M. H. Phan*, H. X. Peng, S. C. Yu, M. R. Wisnom

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

38 Citations (Scopus)

Abstract

A new kind of composite material consisting of parallel Co-based ferromagnetic microwires embedded in a polymer matrix was designed and produced for high-performance sensor applications. A great enhancement of the giant magnetoimpedance (GMI) effect and its field sensitivity was achieved in these composite materials. It was found that the GMI effect strongly increased with increasing number of ferromagnetic microwires. At a given frequency of 10 MHz, the GMI ratio and its field sensitivity reached the highest values of 450% and 45%/Oe for the composite containing four microwires when compared with those of 14% and 1%/Oe for that containing one microwire. This indicates that the newly developed composite material is very promising for high-performance GMI sensor applications. It was revealed that the increase of the GMI effect in the composite sample was attributed to the decrease of electrical resistance and the increase of effective permeability. An increase of GMI effect with reducing microwire length was also observed and attributed to decrease of the electrical resistance. (c) 2007 Elsevier B.V. All rights reserved.

Translated title of the contributionLarge enhancement of GMI effect in polymer composites containing Co-based ferromagnetic microwires
Original languageEnglish
Pages (from-to)253 - 256
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume316
Issue number2
DOIs
Publication statusPublished - Sep 2007
EventJoint European Magnetic Symposia (JEMS 06) - San Sebastian, Spain
Duration: 26 Jun 200629 Jun 2006

Bibliographical note

Publisher: Elsevier

Keywords

  • GIANT MAGNETOIMPEDANCE
  • magnetic sensor
  • WIRES
  • magnetic composite
  • magnetoimpedance effect

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