The effects of the copper wire diameter deposited with multilayer [Cu/Ni80Fe20]3 to its magneto-impedance ratio have been observed. The observation is conducted at low frequencies (20 – 100 kHz) with variations of copper wire diameter from 0.1 to 1 mm. The results show that the maximum magneto-impedance ratio is achieved at the wire diameter of 0.5 mm which is equal to 54.6% / Oe. At the wire diameter of less than 0.5 mm, the magneto-impedance ratio increases with the increasing diameter. While the magneto-impedance ratio decreases with the increasing diameter at the wire diameter of more than 0.5 mm. Studies on the influences of diameter is an important part to optimize the manufacture of magnetic sensor based on magneto-impedance effect on the wire.

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