Surface magnetic anisotropy in nearly zero magnetostrictive CAW and GCAW by FMR measurements

The surface anisotropy distribution in conventional amorphous wires (CAW) and glass-coated microwires (GCAW) with nearly zero magnetostriction and nominal composition Co68.15Fe4.35Si12.5B15 is analyzed by ferromagnetic resonance (FMR) measurements. The derivative resonance spectrum changes with applied tensile stress and torque. The surface anisotropy fields were calculated for both type wires. The experimental results are explained considering the coupling between magnetostriction and applied stress.