Influence of Gamma Irradiation to Magneto-Impedance Ratio in the Electrodeposited [NiFe/Cu]₄ Multilayer

Abstract

Influence of gamma irradiation to the magneto-impedance ratio of the electrodeposited [NiFe/Cu]4 multilayer on meander-shape PCB substrate has been studied. The magneto-impedance ratios were measured for both un-irradiated and irradiated by gamma radiation of Co-60 with a total dose of 40 Gy. The morphological structure were done by using scanning electron microscopy (SEM). The decrease in grain size of the samples after Gamma irradiated is observed. The magnetic property modifies as consequence of the change in the microstructure samples. Within result, the magneto-impedance ratio decreases around 34.9% for irradiated sample.

Magnetoimpedance effect on multilayer [NiFe/Cu/NiFe]3 and supermultilayer [NiFe/Cu/NiFe]3/Cu/[NiFe/Cu/NiFe]3 on Cu PCB meander substrate

“…This condition also occurs in supermultilayer structure which can be observed in Figure 3 (b). The increase in the value of the MI ratio is due to the influence of the increasing frequency of the AC current due to the influence of skin depth [12]. The amount of skin depth is inversely proportional to the frequency of the AC flowing.…”