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| Super-giant Magneto-Impedance Effect of a LC-resonator Using a Glass-Coated Amorphous Microwire |
| Journal of Magnetics, Volume 7, Number 4, 31 Dec 2002, Pages 160-164 |
Heebok Lee*  (Department of Physics Education, Kongju National University), Yong-Seok Kim(Department of Physics Chungbuk National University), Seong-Cho Yu(Department of Physics Chungbuk National University) |
| Abstract |
| A new discovery of the super-giant magneto-impedance (SGMI) effect was found out in a LC-resonator consisted of a glass-coated amorphous CO83.2B3.3Si5.9Mn7.6 microwire. The measurement was carried out at high frequency range from 100 MHz up to 1 GHz of an ac-current flowing along the wire and at varying axial dcmagnetic field in its range of ±120 Oe. The wires, about 16 µm in diameter, were fabricated by a glass-coated melt spinning technique. The shape of the impedance curves plotted vs. a dc-field is changing dramatically with the frequency. The phase angle was also strongly dependent on this field. The external dc-magnetic field changes the circumferential permeability as well as the penetration depth, both in turn change the impedance of the sample. The drastic increments of SGMI at high frequency can be understood in terms of the LC-resonance phenomena. The sudden change of the phase angle, as large as 180° evidenced the occurrence of the resonance at a given intensity of the external dc-field. The maximum ratio of SGMI reached in the experiment by precise tuning frequency equals 450,000％ at the frequency of around 551.9075 MHz. |
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