The work is devoted to the study of magneto-optical (MO) and magnetic properties of the amorphous ribbons NiCoFeSiB obtained by quenching from a melt. Measurements on a magnetometer with a vibrating sample showed that the amorphous ribbon in question is characterized by a low value of coercive force and a high value of saturation magnetization. The magneto-optical properties of the ribbon were investigated using a magneto-optical Kerr microscope. It is established that the considered amorphous ribbon has a pronounced equilibrium domain structure, which is preserved in the absence of an external magnetic field. The domain wall dynamics in low-frequency magnetic fields (0.1, 0.5 and 1 Hz) of small amplitudes (up to 12 Oe) was studied. The dependences of the domain wall displacement vs time for different values of the external magnetic field amplitudes and frequencies were obtained and the dependences of the domain wall velocity vs the field amplitude were calculated. The possibility to determine the surface domain wall velocity for various sections of the studied amorphous ribbon has been confirmed. The described method of measuring the domain wall mobility makes it possible to study the dynamic characteristics of samples under various external conditions.
75.60.Ch Domain walls and domain structure
78.20.Ls Magneto-optical effects
$^1$Moscow State University, Faculty of Physics
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