The ferromagnetic monolayer Fe(110) on W(110) |
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Authors: | U Gradmann G Liu H J Elmers M Przybylski |
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Institution: | 1. Physikalisches Institut, Technische Universit?t Clausthal and Sonderforschungsbereich 126 of the Deutsche Forschungsgemeinschaft, D-3392, Clausthal-Zellerfeld, Fed. Rep. Germany
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Abstract: | Ferromagnetic order in the pseudomorphic monolayer Fe(110) on W(110) was analyzed experimentally using Conversion Electron Mössbauer Spectroscopy (CEMS) and Torsion Oscillation Magnetometry (TOM). The monolayer is thermodynamically stable, crystallizes to large monolayer patches at elevated temperatures and therefore forms an excellent approximation to the ideal monolayer structure. It is ferromagnetic below a Curie-temperatureT c,mono, which is given by (282±3) K for the Ag-coated layer, (290±10) K for coating by Cu, Ag or Au and ≈210 K for the free monolayer. For the Ag-coated monolayer, ground state hyperfine fieldB hf (0)=(11.9±0.3) T and magnetic moment per atom μ=2.53 μB could be determined, in fair agreement with theoretical predictions. Unusual properties of the phase transition are detected by the combination of both experimental techniques. Strong magnetic anisotropies, which are essential for ferromagnetic order, are determined by CEMS. |
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