X-ray photoelectron spectroscopy and magnetism of Mn1−x
Alx alloys

• Authors: Vasile Rednic , Lidia Rednic , Marin Coldea , Viorel Pop , Manfred Neumann , Roxana Pacurariu , Arthur Tunyagi
• Languages of publication: EN

Abstracts

EN

X-ray photoelectron spectroscopy (XPS), magnetization and magnetic susceptibility of Mn1−x
Alx (x = 0.0, 0.2, 0.4, 0.5, 0.6, 0.7) alloys are reported. X-ray diffraction measurements showed that all investigated samples have the same crystallographic structure as the parent compound (AuCu3-structure type). The alloys are disordered for x ≤ 0.5, but become almost crystallographically ordered for higher Al concentration. This change in the crystallographic order is reflected both in the magnetization and Curie temperature values. The exchange interaction is ferromagnetic between the pairs of the near-neighbour Mn-Ni and Ni-Ni magnetic moments and antiferromagnetic for Mn-Mn pairs. The last one is present only in the disordered alloys, which leads to smaller values of the magnetization of these alloys in comparison with the ordered ones. The Mn magnetic moment has the fully ordered value of 3.2 μB in all investigated alloys. The decrease of the Ni magnetic moment as the Al concentration increases may be explained by the hybridization of the Ni 3d and Al 3sp states, which leads to a partial filling of the Ni 3d band. The magnetic susceptibility measurements pointed out the existence of spin fluctuations on Ni sites.

Keywords

EN

transition metal alloys and compounds; magnetic measurements; XPS spectra; local moments; spin fluctuations

Discipline

• 71.20.Lp: Intermetallic compounds
• 75.20.Hr: Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions(for Kondo effect and scattering mechanisms in electronic conduction, see 72.15.Qm and 72.10.Fk)
• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 79.60.-i: Photoemission and photoelectron spectra(for photoelectron spectroscopy, see 87.64.ks in biological physics; 82.80.Pv in chemical analysis)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 3
• Pages: 434-439

Dates

published

1 - 9 - 2008

online

17 - 7 - 2008

Contributors

author

Vasile Rednic

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

author

Lidia Rednic

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

author

Marin Coldea

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

author

Viorel Pop

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

author

Manfred Neumann

• Fachbereich Physik, University of Osnabrück, 49069, Osnabrück, Germany

author

Roxana Pacurariu

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

author

Arthur Tunyagi

• Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

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Identifiers

DOI

10.2478/s11534-008-0093-2