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Open Access Nano Express

Enhanced giant magnetoimpedance in heterogeneous nanobrush

Yi Zhang, Congpu Mu, Caiqin Luo, Juan Dong, Qingfang Liu and Jianbo Wang*

Author Affiliations

Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People’s Republic of China

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Nanoscale Research Letters 2012, 7:506  doi:10.1186/1556-276X-7-506

Published: 10 September 2012

Abstract

A highly sensitive and large working range giant magnetoimpedance (GMI) effect is found in the novel nanostructure: nanobrush. The nanostructure is composed of a soft magnetic nanofilm and a nanowire array, respectively fabricated by RF magnetron sputtering and electrochemical deposition. The optimal GMI ratio of nanobrush is promoted to more than 250%, higher than the pure FeNi film and some sandwich structures at low frequency. The design of this structure is based on the vortex distribution of magnetic moments in thin film, and it can be induced by the exchange coupling effect between the interfaces of nanobrush.

Keywords:
nanobrush; giant magnetoimpedance; micromagnetic simulation; FMR