We present experimental data on the magnetic properties of atomically thin fcc (Î³-phase) Fe films (1-6 atomic layer nominal thickness) epitaxially grown on (Formula presented) obtained by linear magnetic dichroism in the angular distribution of Fe (Formula presented) core photoelectrons excited by linearly polarized synchrotron radiation. The sign and magnitude of the Fe (Formula presented) photoemission magnetic asymmetry indicates the onset of in-plane ferromagnetism at 2.5(2) monolayer (ML) thickness of Î³-Fe. The Curie temperature is 288(2) K for 4 ML thickness. The magnetic splitting of the Fe (Formula presented) core hole sublevels is 1.10(2) eV, i.e., the same value as measured for a bcc-Fe(100) surface where large surface and near-surface enhanced moments contribute. These results characterize the epitaxial Î³-Fe on (Formula presented) as a high-spin ferromagnet for thickness up to 4 ML, with an average magnetic moment per iron atom of 2.5(1)(Formula presented) A phase transition occurs between 4 and 5 ML thickness: the magnetic order of the pseudomorphic Î³-Fe film decreases consistently with the breaking into two phases with the deeper layers in a low-spin and/or antiferromagnetic phase and surface restricted ferromagnetism, similar to the case of Î³-Fe/Cu(100). Â© 1998 The American Physical Society.
Magnetism of atomically thin fcc Fe overlayers on an expanded fcc lattice: Cu84Al16(100) / W.A.A. Macedo, F. Sirotti, G. Panaccione, A. Schatz, W. Keune, W.N. Rodrigues, G. Rossi. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 58:17(1998), pp. 11534-11538.
|Titolo:||Magnetism of atomically thin fcc Fe overlayers on an expanded fcc lattice: Cu84Al16(100)|
ROSSI, GIORGIO (Ultimo)
|Parole Chiave:||Phase-transition; gamma-FE; interface formation; ultrathin films; epitaxial FE; CU(100); photoemission; dichroism; ferromagnetism; magnetization|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||1998|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevB.58.11534|
|Appare nelle tipologie:||01 - Articolo su periodico|