VP18-05 Giant Magnetoimpedance and Susceptibility by Magneto-optical Kerr Effect in Amorphous CoFeSiB Ribbons
Creators: F.A.F. ALBUQUERQUE
V. BELLINTANI JR
J.H.F. SEVERO
A.D. SANTOS and C.S. MARTINS
Publisher: name: IEEE
Year: 2025

Giant Magnetoimpedance (GMI) is a large variation in the impedance Z (H) of magnetic materials when subjected to an external magnetic field[1,2]. The objective of this work is to analyze samples of amorphous magnetic materials, in the case of CoFeSiB ribbons, which were produced by melt-spinning. The Giant Magnetoimpedance measurements that will be presented were carried out in low and moderate frequency regimes. It was observed that the increase in the impedance value with frequency is related to the increase in the imaginary contribution. The peak value of magnetoimpedance is completely frequency dependent. In figure 01 it is possible to observe that there is a variation in impedance according to the applied field, with a peak at 10 Oe. At 1 MHz, representing a variation of 75% and a sensitivity of 7.5%/Oe. Furthermore, it was observed that the susceptibility measured by the magneto-optical Kerr effect presents a behavior similar to that of magnetoimpedance[3].References: [1] F. L. A. Machado, B. L. da Silva, S. M. Rezende, C.S. Martins.“Giant ac magnetoresistance in the soft ferromagnet Co70.4Fe4.6Si15B10” J. Appl. Phys, Vol.75, p.6563 (1994). [2] R.S. Beach, A.E. Berkowitz, “Sensitive field and frequency dependent impedance spectra of amorphous FeCoSiB wire and ribbon (invited)”, J. Appl Phys.Vol 76,p. 6209(1994). [3] P. Corte-Leon et al. “Giant magnetoimpedance and magneto-optical Kerr effects in (Co63Ni37)75Si15B10 amorphous ribbon”, Intermetallics,Vol.125, p.106925(2020).
Giant Magnetoimpedance (GMI) is a large variation in the impedance Z (H) of magnetic materials when subjected to an external magnetic field[1,2]. The objective of this work is to analyze samples of amorphous magnetic materials, in the case of CoFeSiB ribbons, which were produced by melt-spinning. The Giant Magnetoimpedance measurements that will be presented were carried out in low and moderate frequency regimes. It was observed that the increase in the impedance value with frequency is related to the increase in the imaginary contribution. The peak value of magnetoimpedance is completely frequency dependent. In figure 01 it is possible to observe that there is a variation in impedance according to the applied field, with a peak at 10 Oe. At 1 MHz, representing a variation of 75% and a sensitivity of 7.5%/Oe. Furthermore, it was observed that the susceptibility measured by the magneto-optical Kerr effect presents a behavior similar to that of magnetoimpedance[3].References: [1] F. L. A. Machado, B. L. da Silva, S. M. Rezende, C.S. Martins.“Giant ac magnetoresistance in the soft ferromagnet Co70.4Fe4.6Si15B10” J. Appl. Phys, Vol.75, p.6563 (1994). [2] R.S. Beach, A.E. Berkowitz, “Sensitive field and frequency dependent impedance spectra of amorphous FeCoSiB wire and ribbon (invited)”, J. Appl Phys.Vol 76,p. 6209(1994). [3] P. Corte-Leon et al. “Giant magnetoimpedance and magneto-optical Kerr effects in (Co63Ni37)75Si15B10 amorphous ribbon”, Intermetallics,Vol.125, p.106925(2020).