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X-ray photoelectron spectroscopy and magnetism of AlMnNi6 and Al7Mn3Ni30

L. REDNIC1,* , R. PACURARIU1, V. REDNIC1, L. G. PASCUT1, V. POP1, M. NEUMANN2, M. COLDEA1

Affiliation

  1. Babes-Bolyai University, Faculty of Physics, 3400 Cluj-Napoca, Romania
  2. University of Osnabrück, Fachbereich Physik, 49069 Osnabrück, Germany

Abstract

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 ≡ Al0.5Mn0.5Ni3 and Al7Mn3Ni30 ≡ Al0.7Mn0.3Ni3 exhibit satellites at ~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..

Keywords

X-ray photoelectron spectroscopy, Magnetism, AlMnNi6, Al7Mn3Ni30.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

L. REDNIC, R. PACURARIU, V. REDNIC, L. G. PASCUT, V. POP, M. NEUMANN, M. COLDEA, X-ray photoelectron spectroscopy and magnetism of AlMnNi6 and Al7Mn3Ni30, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 568-571 (2007)