Magnetic Properties and Magnetoimpedance of Electroplated Wires

Abstract

Abstract. Magnetic properties and giant magnetoimpedance (GMI) of CuBe/Fe 20 Co 6 Ni 74 electroplated wires was studied for frequency of 1 MHz and the amplitude of the driving current of 20 mA with focus on the development of magnetic field detectors of particular types. The possibility of quantitative ferrofluid concentration measurements was demonstrated. GMI of electroplated wire can be useful for the study of the dynamic properties of the ferrofluid. GMI of the electroplated wires in the non-uniform field created by the permanent magnet was studied in the configuration adapted for automatic control lines, machinery control, and positioning systems.

Magneto-Impedance Biosensor Sensitivity: Effect and Enhancement

“…They stated that, in the presence of ferrofluid, the maximum MI ratio increased from 315% to 417% and the sensitivity increased approximately 150% at frequency of 4.5 MHz. These findings are not entirely congruent with the MI effect values reported by Kurlyandskaya et al, who observed an MI ratio decrease from 108% to 104% in the presence of ferrofluid particles [ 102 , 104 ]. The disparity in these results is not certain and may be due to differences in the two testing methods used and in the superimposed magnetic fields induced by different ferrofluid distributions.…”

“…Recently, Kurlyandskaya et al linked the drop in the MI effect to the presence of magnetic ferrofluid particles and a high-field hysteresis rise when testing on an electroplated CuBe/FeCoNi wire sensor [ 104 ]. However, Amirabadizadeh et al negated these findings by reporting a greatly improved MI effect tested on a CoFeSiB amorphous wire biosensor using magnetite ferrofluid [ 105 ].…”