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Surface and volume phase states of Fe1−x GaxBO3 crystals in the vicinity of the Néel point

  • Magnetism and Ferroelectricity
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Abstract

The behavior of the magnetic system of a surface layer of macroscopic Fe1−x GaxBO3 crystal (x=0, 0.3) in the vicinity of the Néel temperature T N was studied. The studies were made by a method involving simultaneous gamma, x-ray, and electron Mössbauer 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 T N(L) at which a thin layer at a depth L from the surface switches to a disordered state is lower than T N for the bulk and is lower the closer this layer is to the surface. In the vicinity of T N, a nonuniform state is observed in which the bulk of the crystal is magnetically ordered and the surface layer is disordered. The transition temperature T N(L) decreases from T N to its surface value within a surface layer of a “critical” thickness.

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  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    A. S. Kamzin & R. G. Glyantsev

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  1. A. S. Kamzin
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  2. R. G. Glyantsev
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__________

Translated from Fizika Tverdogo Tela, Vol. 45, No. 12, 2003, pp. 2198–2203.

Original Russian Text Copyright © 2003 by Kamzin, Glyantsev.

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Kamzin, A.S., Glyantsev, R.G. Surface and volume phase states of Fe1−x GaxBO3 crystals in the vicinity of the Néel point. Phys. Solid State 45, 2309–2312 (2003). https://doi.org/10.1134/1.1635503

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