X-ray photoelectron spectroscopy and magnetism of AlMnNi6 and Al7Mn3Ni30

Autor(en): Rednic, L.
Pacurariu, R.
Rednic, V.
Pascut, L. G.
Pop, V.
Neumann, M.
Coldea, M.
Stichwörter: Materials Science; Materials Science, Multidisciplinary; NI3AL; Optics; Physics; Physics, Applied
Erscheinungsdatum: 2007
Herausgeber: NATL INST OPTOELECTRONICS
Journal: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
Volumen: 9
Ausgabe: 3, SI
Startseite: 568
Seitenende: 571
Zusammenfassung: 
X-ray photoelectron spectroscopy (XPS), magnetization and magnetic susceptibility of Mn1-xAlxNi3 (x=0.5, 0.7) alloys are reported. The Ni 2p core level and the valence band spectra of AlMnNi6 equivalent to Al0.5Mn0.5Ni3 and Al7Mn3Ni30 equivalent to Al0.7Mn0.3Ni3 exhibit satellites at similar to 6.5 eV higher binding energy than the main line, indicating the presence of d character in the unoccupied bands. Furthermore, the density of states at the Fermi level in both alloys is smaller than in the metallic Ni, suggesting a partial filling of the Ni 3d band. The magnetization values and its variation with magnetic field and temperature suggest that both alloys have a ferromagnetic behavior below the Curie temperatures 432 K and 361 K for AlMnNi6 and Al7Mn3Ni30, respectively. The results infer the existence of local magnetic moments on Mn and Ni sites in the investigated alloys. The correlation of magnetic data in the ordered and paramagnetic states can be explained if we consider spin fluctuations on Ni sites.
Beschreibung: 
International Conference on Advanced Spectroscopies on Biomedical and Nanostructured Systems, Cluj Napoca, ROMANIA, SEP 03-06, 2006
ISSN: 14544164

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