Abstract
The reversible influence of weakly adsorbed water molecules on the magnetic susceptibility of amorphous ferromagnets of composition Fe 76.5Cu 1Nb 3Si 13.5B 6 is observed by a magneto-optical method at room temperature. The decrease of an amplitude of the domain wall (DW) oscillations is observed when the pressure of water vapour decreases from 400 to 1300 Pa. This effect is explained by appearance of surface perpendicular magnetic anisotropy, which is caused by the sample surface contraction. The surface contraction arises in consequence of the pressure on the walls of the micropores located on the surface of ferromagnets. The pressure is induced by H-bond adsorbed clusters of water molecules. The various magnetic charges emerge on the surfaces of domains through the presence of the surface perpendicular magnetic anisotropy. The field of magnetic charges causes an increase in the restoring force affecting the DW under its displacement from equilibrium position.
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