Abstract
The behavior of the magnetic system of a surface layer of macroscopic Fe1−xGaxBO3 crystal (x=0, 0.3) in the vicinity of the Neel temperature TN was studied. The studies were made by a method involving simultaneous gamma, x-ray, and electron Mossbauer spectroscopy that made it possible to obtain information simultaneously from surface layers and from the bulk of a macroscopic crystal. It was found that the temperature TN(L) at which a thin layer at a depth L from the surface switches to a disordered state is lower than TN for the bulk and is lower the closer this layer is to the surface. In the vicinity of TN, a nonuniform state is observed in which the bulk of the crystal is magnetically ordered and the surface layer is disordered. The transition temperature TN(L) decreases from TN to its surface value within a surface layer of a “critical” thickness.
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