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Reduced magnetic hyperfine field at the surface of α-Fe2O3 and FeBO3 single crystals |
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| Authors: | B Stahl R Gellert M Müller E Kankeleit A Kamzin |
| Institution: | (1) Fachbereich Materialwissenschaft, Fachgebiet Dünne Schichten, TU Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany;(2) Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany;(3) A.F. Joffe-Institut, St. Petersburg, Russia |
| Abstract: | The surface magnetic ordering of an α-57Fe2O3 and 57FeBO3 single crystal was studied by Depth Selective Conversion Electron Mössbauer Spectroscopy (DCEMS). The depth selective Mössbauer data of 57FeBO3 up to the Néel temperature (T N = 348.35 K) reveal the coexistence of the canted antiferromagnetic bulk phase and a magnetic surface phase that shows time relaxation. Both phases are separated by a wall (interim layer) and the thickness of the magnetic surface layer increases as the crystal is heated to T N. |
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