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

• Autorzy: Vasile Rednic , Lidia Rednic , Marin Coldea , Viorel Pop , Manfred Neumann , Roxana Pacurariu , Arthur Tunyagi
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

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

• Czasopismo: Open Physics
• Rocznik: 2008
• Tom: 6
• Numer: 3
• Strony: 434-439

Daty

wydano

2008-09-01

online

2008-07-17

Twórcy

autor

Vasile Rednic

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

autor

Lidia Rednic

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

autor

Marin Coldea

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

autor

Viorel Pop

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

autor

Manfred Neumann

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

autor

Roxana Pacurariu

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

autor

Arthur Tunyagi

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

Bibliografia

• [1] V.Yu. Irkhin, M.I. Katsnelson, A.V. Trefilov, J. Phys.-Cond. Matter 5, 8763 (1993) http://dx.doi.org/10.1088/0953-8984/5/46/014[Crossref]
• [2] J. Friedel, Nuovo Cimento Suppl. 2, 287 (1958)
• [3] P.W. Anderson, Phys. Rev. 124, 41 (1961) http://dx.doi.org/10.1103/PhysRev.124.41[Crossref]
• [4] M.A. Howson, Contemp. Phys. 35, 347 (1994) http://dx.doi.org/10.1080/00107519408222100[Crossref]
• [5] T. Moriya, J. Magn. Magn. Mat. 31–34, 10 (1983) http://dx.doi.org/10.1016/0304-8853(83)90139-7[Crossref]
• [6] M.J. Marcinkowski, R.M. Poliak, Phil. Mag. 8, 1023 (1963) http://dx.doi.org/10.1080/14786436308214462[Crossref]
• [7] C.G. Shul, M.K. Wilkinson, Phys. Rev. 97, 304 (1955) http://dx.doi.org/10.1103/PhysRev.97.304[Crossref]
• [8] J.S. Kouvel, C.D. Graham Jr., J.J. Becker, J. Appl. Phys. 29, 518 (1958) http://dx.doi.org/10.1063/1.1723205[Crossref]
• [9] P.J. Kaplan, R.L. Streever, Phys. Rev. B 2, 3449 (1970) http://dx.doi.org/10.1103/PhysRevB.2.3449[Crossref]
• [10] F.R. de Boer, C.J. Schinkel, J. Biesterbos, S. Proost, J. Appl. Phys. 40, 1049 (1969) http://dx.doi.org/10.1063/1.1657528[Crossref]
• [11] Ul-Haq, J.G. Booth, J. Magn. Magn. Mat. 62, 256 (1986) http://dx.doi.org/10.1016/0304-8853(86)90153-8[Crossref]
• [12] T. Shinohara et al., J. Magn. Magn. Mat. 53, L1 (1985) http://dx.doi.org/10.1016/0304-8853(85)90127-1[Crossref]
• [13] W.B. Pearson, A handbook of Lattice Spacings and Structures of Metals and Alloys (Pergamon Press, New York, 1958)
• [14] J. Yeh, I. Lindau, At. Data Nucl. Tables 32, 1 (1958) http://dx.doi.org/10.1016/0092-640X(85)90016-6[Crossref]
• [15] Y. Kurtulus, R. Dronskowki, J. Sol. State Chem. 176, 390 (2003) http://dx.doi.org/10.1016/S0022-4596(03)00242-1[Crossref]
• [16] R.Y. Umetsu, K. Fukamichi, A. Sakuma, J. Magn. Magn. Mat. 239, 530 (2002) http://dx.doi.org/10.1016/S0304-8853(01)00643-6[Crossref]
• [17] S. Plogmann et al., Phys. Rev. B 60, 6428 (1999) http://dx.doi.org/10.1103/PhysRevB.60.6428[Crossref]
• [18] T. Moriya, Spin Fluctuations in Itinerant Electron Magnetism (Springer-Verlag, Berlin, 1985)
• [19] J.W. Cable, E.O. Wollan, W.C. Koehler, H.R. Child, Phys. Rev. 128, 2118 (1962) http://dx.doi.org/10.1103/PhysRev.128.2118[Crossref]
• [20] T. Busgen, J. Feydt, R. Hassdorf, S. Thienhaus, M. Moske, Phys. Rev. B 70, 014111 (2004) http://dx.doi.org/10.1103/PhysRevB.70.014111[Crossref]
• [21] K. Kneller, in Ferromagnetismus (Springer-Verlag, Berlin, 1962) 150

Identyfikatory

DOI

10.2478/s11534-008-0093-2