Abstract
Studies of the local magnetic properties and near-surface micromagnetic structure of as-cast and annealed (550°C for 1 h) Fe 73.5Cu 1Nb 3Si 13.5B 9 amorphous microwires with a magnetic core of 10-μm diameter were carried out employing a magneto-optical micro-magnetometer. The as-cast wires were amorphous. The annealed wires exhibited an ultra-fine structure with a grain size of 10–12 nm. A strong inhomogeneity of the near-surface magnetic properties of the as-cast samples was found. This was explained by the dispersion of the magnetic anisotropy, which is a typical phenomenon for as-cast amorphous materials. Nanocrystalline phase formation in the annealed wires was found to lead to an improvement in their soft magnetic properties and a significant increase in the homogeneity of the magnetic characteristics. The magnetic field behaviour of the near-surface magnetization components allows us to conclude that there is a curling mode of the magnetization reversal in the examined microwires.
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