GROWTH OF ULTRATHIN MnFILMS ON Ag(100) EVIDENCE OF A BURIED MnMONOLAYER

P. Schieffer, M. C. Hanf (), C. Krembel, M. H. Tuilier, G. Gewinner and D. Chandesris
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P. Schieffer: Laboratoire de Physique et de Spectroscopie Electronique, Faculté des Sciences et Techniques, 4, rue des Frères Lumière, 68093 Mulhouse, France
M. C. Hanf: Laboratoire de Physique et de Spectroscopie Electronique, Faculté des Sciences et Techniques, 4, rue des Frères Lumière, 68093 Mulhouse, France;
C. Krembel: Laboratoire de Physique et de Spectroscopie Electronique, Faculté des Sciences et Techniques, 4, rue des Frères Lumière, 68093 Mulhouse, France
M. H. Tuilier: Laboratoire de Physique et de Spectroscopie Electronique, Faculté des Sciences et Techniques, 4, rue des Frères Lumière, 68093 Mulhouse, France
G. Gewinner: Laboratoire de Physique et de Spectroscopie Electronique, Faculté des Sciences et Techniques, 4, rue des Frères Lumière, 68093 Mulhouse, France
D. Chandesris: Laboratoire pour l'Utilisation du Rayonnement Electromagneétique, Université Paris-Sud, 91405 Orsay, France

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1251-1256

Abstract: Mnfilms with a thickness of one monolayer have been deposited, in ultrahigh vacuum, on aAg(100)single crystal at room temperature, and analyzed by X-ray photoelectron diffraction (XPD) and surface extended X-ray absorption fine structure (SEXAFS). The strong enhancement of the X-ray photoelectronMn2p3/2signal along the Ag[1100] direction indicates that a substantial fraction of the Mn atoms is located within the second topmost atomic layer. The SEXAFS data demonstrate that theMn–AgandMn–Mnfirst neighbor distances are the same as theAg–Agdistances in theAglattice; as a result, the atoms occupy Ag sites on the fcc lattice. Comparison of the experimental data with FEFF calculations indicates that a superficialMn–Agalloy is formed. If the film is mildly (330 K) annealed, the contrast in theXPD Mn 2p3/2modulations versus polar angle increases and reaches a maximum value of 60%. As confirmed by single scattering simulations, these results mean that atomic place exchange occurs betweenMnandAgatoms, and eventually the second atomic plane of the sample is constituted mainly byMnatoms, whereas the first atomic layer is a pure Ag plane, i.e. a buried atomicMnmonolayer is formed.

Date: 1997
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DOI: 10.1142/S0218625X97001620

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