GMI effect in amorphous glass covered microwires as a function of the internal induced stresses

This paper presents the theoretical calculation of the internal stresses distribution for Co_68.15Fe_4.35Si_12.5B₁₅ amorphous glass covered wires with metallic core diameter of 5,10,15 and 20mum, respectively, and glass coating thicknesses of 7,12 and 20mum. This behavior is extremely useful for sensor applications and is related strongly to the radial and circumferential magnetic anisotropies distribution on the wire surface and in its volume, being influenced by the magnetic permeability and penetration depth. The GMI effect is affected by the value and direction of induced stresses during the preparation process as well as by the difference between the thermal expansion coefficients of the metallic core and glass cover.