Tunnel magneto-impedance effect of the ZnNi-ferrite encapsulated NiFe microspheres

C. M. Fu, C. Y. Hsu, Y. C. Chao, D. S. Kim, N. Matsushita, M. Abe

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Abstract

We report the first observation of spin tunneling effect on the ZnNi-ferrite encapsulated Ni-Fe microspheres, which is measured by the impedance spectra using a network analyzer. The field dependence of impedance of the composites has shown a typical behavior of magneto-tunneling effect, with a maximum magneto-impedance ratio of about 2.35%, at a frequency of 100 kHz and at the room temperature. The temperature dependence of the magnetoimpedance and dielectric modulus has been investigated to explore the origin for tunneling mechanism. Implications for magnetic sensing are discussed.

Original languageEnglish
Pages (from-to)e1839-e1841
JournalJournal of Magnetism and Magnetic Materials
Volume272-276
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 2004 May 1

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Keywords

  • Magnetoimpedance
  • Microspheres
  • Spin tunneling
  • ZnNi-ferrite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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