Open AccessInfluence of field annealing on giant magneto-impedance effect of Co-based melt extraction amorphous wires
Author(s) -
Shuling Zhang,
Jianfei Sun,
Dan Xing
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2068
Subject(s) - materials science , giant magnetoimpedance , anisotropy , transverse plane , annealing (glass) , magnetic field , permeability (electromagnetism) , nuclear magnetic resonance , amorphous solid , electrical impedance , composite material , condensed matter physics , optics , giant magnetoresistance , magnetoresistance , physics , chemistry , structural engineering , organic chemistry , quantum mechanics , membrane , engineering , biology , genetics
In order to investigate the influence of anneal treatment on the Co-based melt extraction wires, the soft magnetic properties and giant magnet-impedance GMI effect of the annealed Co75Fe40Si8B12Nb1 wire are investigated. Samples are prepared using melt extraction technology in vacuum and annealed at 450℃ without magnetic field or with miagntic field either longitudinal or transverse to the axis of wire of strength from 500 Oe to 4000 Oerespectively. The magnetic softness and GMI response are measured using HP4192 Impedance Analyzer and Lakeshore7407 VSM. Test results show that the circular anisotropy and GMI response are reduced after longitudinal field anneal treatment. GMI profiles are single-peaked and the maximum impedance ratio ΔZ/Z is 131% and field sensitivity is 7%/Oe. The circular permeability and GMI response are improved after transverse field anneal treatments because of the increased circular anisotropy. At higher frequenciesthe GMI profiles change from single-peaked to two-peaked after being annealed in strong transverse field. The circular permeability is increased and GMI effect gets stronger with the increase of current frequency and anneal field. The largest impedance ratio of 190% with a field sensitivity of 26%/Oe is obtained for the Co-based transverse field annealed wires at 10 MHz. The correlations between the circular permeabilitythe GMI effect and the current frequency are discussed in the light of a skin effect model.