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Fabrication and study of Ni75Fe25-SiO2 granular films for high frequency application

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8 Author(s)
Ge, Shihui ; Key Lab. for magnetism & Magnetic Mater. of Ministry of Educ., Lanzhou Univ., China ; Xiaolin Yang ; Kim, Kwang Youn ; Xi, Li
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Ni75Fe25-SiO2 granular films are fabricated and studied for high frequency applications. The films of different metal volume fraction fv are fabricated by magnetron co-sputtering and they have fcc Ni3Fe structure determined by X-ray diffraction. Magnetic hysteresis loops show that the samples of fv=0.81 have in plane uniaxial anisotropy. The resistivity ρ is shown to increase slowly with decreasing fv then increases rapidly after fv>0.7, while coercivity Hc decreases rapidly as fv decreases from 0.81 to 0.52 and does not exceed 5 Oe. In this fv range, good soft magnetic properties are obtained especially for the sample with fv=0.52 in which ρ reaches 19000 μΩ·cm with negative temperature coefficient. This high ρ effectively depresses the eddy current loss as applying for high frequency range. These interesting behavior is understood by exchange coupling between nanoparticles.

Published in:

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Date of Conference:

4-8 April 2005

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