High-frequency magnetoimpedance in Co/sub 83.2/Mn/sub 7.6/Si/sub 5.9/B/sub 3.3/ glass-coated microwires

Summary form only given. The giant magnetoimpedance effect (GMI) in soft magnetic ribbons and wires consists in a large impedance change under an applied magnetic field. The discovery of this effect, having an electromagnetic origin, has gained a renewed interest in soft amorphous alloys due to promising application as magnetic sensors. An alternative method to evaluate the magnetotransport properties of soft magnetic materials at high frequencies is highlighted here and measurements performed on glass-coated Co-based microwires will be presented. The magnetoimpedance effect in amorphous Co/sub 83.2/Mn/sub 7.6/Si/sub 5.9/B/sub 3.3/ microwires (metallic diameter/spl sime/20 /spl mu/m, glass-coating thickness/spl ap/5 /spl mu/m), prepared by the Taylor-Ulitovsky method, was studied in a wide frequency interval (30 MHz/spl divide/6 GHz) by means of a network analyser.