Investigation of Co-rich amorphous microwires by help of magneto-optical method with micron resolution

Abstract Results on the magneto-optical investigation of near-surface micromagnetic structure of Co69Fe4Si12B15 amorphous wires 10–50 μm in diameter are presented. By scanning the light spot of 1-μm-diameter along the wire length, distributions of magnetization components and also local hysteresis characteristics of the wires were measured. It was experimentally established that the examined microwires have a circumferential magnetic anisotropy. In consequence, there are the near-surface alternate left- and right-handled circular domains in these samples. The dependencies of the circular domain width on the wire diameter and length were found. It was proved that the dominant mechanism of the wire magnetization reversal in the axial magnetic field is rotation of local magnetization vectors in circular domains.