%0 Journal Article %T Giant Magnetoimpedance in Electrodeposited Cobalt on Silver Wires %A Pongsakorn JANTARATANA %A Chitnarong SIRISATHITKUL %J Walailak Journal of Science and Technology %D 2006 %I Walailak University %R 10.2004/vol3iss2pp261-271 %X Cobalt of thickness from 1 to 25 mm was coated onto 120 mm-diameter silver wires by electrodeposition. Giant magneto-impedance (GMI) of electrodeposited cobalt on silver wires was measured with ac current from 1 kHz to 1 MHz. Their impedance decreased with a longitudinal magnetic field and saturated under 1.5 kOe. With increasing cobalt thickness, the critical frequency decreased but the GMI ratio increased. A maximum GMI ratio of over 200 % and sensitivity of about 0.5 %/Oe were observed in a 25 mm-thick sample at the frequency of about 500 kHz. The results can be explained by the dependence of the circumferential permeability on the magnetic field and frequency of ac current. %K Giant magnetoimpedance %K magnetic permeability %K skin depth %K electrodeposition %U http://wjst.wu.ac.th/index.php/wjst/article/view/142