Giant magnetoimpedance effect of Co68.15 Fe4.35 Si12.5 B15 amorphous wire in the presence of magnetite ferrofluid

Abstract

Giant magnetoimpedance effect (GMI) in Co_68.15 Fe_4.35 Si_12.5 B₁₅ amorphous wire was studied in the presence of magnetite ferrofluid and without it. Magnetite nanoparticles for ferrofluid were prepared by the traditional wet chemistry co-precipitation method. GMI was measured in the frequency range of 2 to 6 MHz. The maximum value of GMI value of the ferrofluid covered amorphous wire was increased in all frequency intervals in comparison with GMI response of the wire non-covered by ferrofluid. These results open a new way of increasing magnetoimpedance effect value useful for sensor applications.