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| VOLUME 57 (1993) | ISSUE 9 |
PAGE 538
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Mossbauer study of surface magnetic properties of the antiferromagnet Fe3B06 near the Neel temperature
Kamzin A. S. , Grigor'ev L. A.
The behavior of the magnetic system of antiferromagnetic Fe3B06 crystal was investigated in surface layers of the bulk crystal near the Neel temperature. The experimental method, based on the Mossbauer effect, made it possible to study simultaneously the surface and volume properties of bulk material. On the basis of the experimental results it is assumed that there exists a surface layer of "critical" thickness, within which the transition temperature TN{L) increases with the distance from the surface and reaches at the lower (from the surface) boundary of the "critical" layer the value of TN corresponding to the volume of the crystal. It was found that the transition to the paramagnetic phase is accompanied by relaxation of the spin magnetic moments. These relaxation processes are observed in the bulk in a very narrow temperature range, but as the surface is approached, this range increases significantly within the "critical" layer.
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![](/ps/1182/article_17833_800_head.png "The behavior of the magnetic system of antiferromagnetic Fe<sub>3</sub>B0<sub>6</sub> crystal was investigated in surface layers of the bulk crystal near the Neel temperature. The experimental method, based on the Mossbauer effect, made it possible to study simultaneously the surface and volume properties of bulk material. On the basis of the experimental results it is assumed that there exists a surface layer of "critical" thickness, within which the transition temperature <i>T<sub>N</sub>{L) </i>increases with the distance from the surface and reaches at the lower (from the surface) boundary of the "critical" layer the value of <i>T<sub>N</sub> </i>corresponding to the volume of the crystal. It was found that the transition to the paramagnetic phase is accompanied by relaxation of the spin magnetic moments. These relaxation processes are observed in the bulk in a very narrow temperature range, but as the surface is approached, this range increases significantly within the "critical" layer.")