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http://dx.doi.org/10.5369/JSST.2007.16.5.389

Magneto-impedance effect of CoFeSiBNi amorphous magnetic films  

Lee, Seung-Hun (Nano-Science Research Division, Korea Institute of Science and Technology)
Park, Byung-Kyu (School of electrical engineering, Korea Univ.)
Hwang, Sung-Woo (School of electrical engineering, Korea Univ.)
Moon, Sung (Nano-Science Research Division, Korea Institute of Science and Technology)
Publication Information
Journal of Sensor Science and Technology / v.16, no.5, 2007 , pp. 389-393 More about this Journal
Abstract
Soft ferromagnetic materials are very useful for many sensors using magnetic materials demanding high permeability, low coercivity and low hysteresis loss. Among them, FeCoSiBNi amorphous magnetic films show a good impedance change (about 5.01 %/Oe, at 10 MHz) by the exterinal magnetic field in this experiment. The magnetic films are produced by melt-spun method, one of the rapid solidification process. Ribbon shape wires were made from the films, and let them annealed in DC magnetic field to increase the maximum Giant Magneto Impedance ratio. Field annealing decreases the stress and changes the effective anisotropy. Thus, we can find that the impedance change (200.47 %) is improved and the fabricated magnetic wire has characteristics of good sensor element.
Keywords
MI effect; soft magnetic; amorphous magnetic film; magnetic sensor; skin effect; Annealing;
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