I n ferromagnetic materials with large anisotropy constants ( K , > lo8 erg/cm3) the domain wall width, dB, is of the order of magnitude of a few lattice constants (10 to 30 A). The spin configuration of such 180"-walls in Co,R-compounds is determined within the framework of the Heisenberg model. It is found that the deviations from the microniagnetic solution occur mainly in the centre of the wall.
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