MAGNETIC-PROPERTIES AND GIANT MAGNETO-IMPEDANCE IN AMORPHOUS FENICRSIB FILMS

The giant magneto-impedance effect has been observed at room temperatu re in amorphous FeNiCrSiB films prepared by RF sputtering followed by an annealing treatment. The frequency spectra and field dependence of the effect are studied in the frequency range from 100 kHz to 13 MHz a nd the magnetic field range from 0 to 70 Oe; The longitudinal, transve rse and perpendicular effects are observed in detail; A transverse mag neto-impedance effect with a magnitude similar to the longitudinal cas e has been obtained, and a large perpendicular MI effect is also obtai ned. A maximum GMI ratio of about 38% is obtained at 13 MHz in the lon gitudinal and transverse cases. The field sensitivity of the longitudi nal GMI is 3.4% Oe(-1) at 13 MHz. A large perpendicular MI ratio of 11 % is obtained at 11 MHz. The effect of annealing on the effective perm eability and GMI is reported in this paper.