Studies of magnetic properties and giant magnetoimpedance effect in ultrathin magnetically soft amorphous microwires

We report novel results on studies of giant magnetoimpedance (GMI) effect and magnetic properties in ultrathin amorphous glass-coated microwires with nearly zero and negative magnetostriction constant and metallic nucleus diameter ranging within 6 and 12μm. Off-diagonal MI curve of Co67.1Fe3.8Ni1.4Si14.5B11.5Mo1.7 microwire exhibits asymmetrical shape with almost linear growth within the field range from −Hm to Hm associated with the anisotropy field. Co74B13Si11C2 microwire possesses hysteretic off-diagonal MI curve. Current annealing significantly changes off-diagonal MI curves, especially in the case of Co74B13Si11C2 microwire.