Giant Magnetoimpedance in Fe_73.5Cu₁Nb₂V₁Si_13.5B₉ Nanocrystalline Ribbons

Abstract:

In the present work, the giant magnetoimpedance effect has been found in Fe_73.5Cu₁Nb₂V₁Si_13.5B₉ nanocrystalline ribbons. The optimum annealing temperature for obtaining largest GMI is about 550°C. Fe_73.5Cu₁Nb₂V₁Si_13.5B₉ with average grain size of 15 nm after annealing at 550°C for 30 min presents a magnetoimpedance of-74% at 700 kHz under H=90 Oe. The MI effect at high frequency is due to the change of Z via the variation of permeability or the penetration depth under the external field. The positive magnetoimpedance ΔZ/Z is 36% and positive magnetoresistance ΔR/R is 79% at H= 10 Oe and f=5MHz. We observe a huge magnetoreactance ΔX/X of –375% at a very low frequency of 50 kHz, which is a magnetoinduction effect due to the movement of domain wall. The smaller GMI for nanocrystalline Fe_73.5Cu₁Nb₂V₁Si_13.5B₉ ribbons annealed above 550°C is mainly connected with the decrease of permeability due to the precipitation of Fe₂B phase in ribbons. Our results show that the partial substitution of expensive Nb by cheap V in FeCuNbSiB could be a successful way to prepare the GMI materials with high performance and low cost.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 99-104
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.99
• Online since: December 2014
• Authors: Huai Gu Hu, Yang Ming Hao*, Chun Jing Gao, Yan Zhao Wu, Fei Fei Liang
• Keywords: FeCuNbVSiB, Magnetoimpedance Effect, Nanocrystalline, Permeability

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