LAYER MAGNETIZATION CANTING IN FE-57 FESI MULTILAYER OBSERVED BY SYNCHROTRON MOSSBAUER REFLECTOMETRY/

Citation
L. Bottyan et al., LAYER MAGNETIZATION CANTING IN FE-57 FESI MULTILAYER OBSERVED BY SYNCHROTRON MOSSBAUER REFLECTOMETRY/, Hyperfine interactions, 113(1-4), 1998, pp. 295-301
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
ISSN journal
0304-3843
Volume
113
Issue
1-4
Year of publication
1998
Pages
295 - 301
Database
ISI
SICI code
0304-3843(1998)113:1-4<295:LMCIFF>2.0.ZU;2-D
Abstract
Synchrotron Mossbauer reflectometry and GEMS results on a [Fe-57(2.55 nm)/FeSi (1.57 nm)](10) multilayer (ML) on a Zerodur substrate are rep orted. CEMS spectra are satisfactorily fitted by alpha-Fe and an inter face layer of random alpha-(Fe, Si) alloy of 20% of the 57Fe layer thi ckness on both sides of the individual Fe layers. Kerr loops show a fu lly compensated AF magnetic layer structure. Prompt X-ray reflectivity curves show the structural ML Bragg peak and Kiessig oscillations cor responding to a bilayer period and total film thickness of 4.12 and 41 .2 nm, respectively. Grazing incidence nuclear resonant Theta-2 Theta scans and time spectra (E = 14.413 keV, lambda = 0.0860 nm) were recor ded in different external magnetic fields (0 < B-ext < 0.95 T) perpend icular to the scattering plane. The lime integral delayed nuclear Thet a-2 Theta scans reveal the magnetic ML period doubling. With increasin g transversal external magnetic field, the antiferromagnetic ML Bragg peak disappears due to Fe layer magnetization canting, the extent of w hich is calculated from the fit of the time spectra and the Theta-2 Th eta scans using an optical approach. In a weak external field the Fe l ayer magnetization directions are neither parallel with nor perpendicu lar to the external field. We suggest that the interlayer coupling in [Fe/FeSi](10) varies with the distance from the substrate and the ML c onsists of two magnetically distinct regions, being of ferromagnetic c haracter near substrate and antiferromagnetic closer to the surface.