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  • 1.
    Abrikosov, Igor
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Liot, Francois
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Marten, Tobias
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Smirnova, E. A.
    Theoretical Physics Department, Moscov Steel and Alloys Institute, Moscow, Russia.
    Magnetism in systems with reduced dimensionality and chemical disorder: the local environment effects2006In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 300, no 1, p. 211-215Article in journal (Refereed)
    Abstract [en]

    We study influence of the local chemical environment, the so-called local environment effects, on the electronic structure and properties of magnetic systems with reduced dimensionality and chemical disorder, and show that they play a crucial role in a vicinity of magnetic instability. As a model, we consider Fe–Ni Invar. We present results obtained from ab initio calculations of the electronic structure, magnetic moments, and exchange interactions in random fcc Fe–Ni alloy, for a single monolayer alloy film on a Cu (0 0 1) substrate as well as in the bulk. We analyze the difference between the film and the bulk magnetization, which is found to be most pronounced for dilute alloys. We also analyze a sensitivity of the individual magnetic moments and effective exchange parameters to the local chemical environment of the atoms.

  • 2.
    Baykov, V.I.
    et al.
    Royal Institute of Technology, Stockholm.
    Korzhavyi, P.A.
    Royal Institute of Technology, Stockholm.
    Smirnova, E.A.
    Department of Theoretical Physics of Steel and Alloys Moscow Russia.
    Abrikosov, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
    Johansson, B.
    Royal Institute of Technology, Stockholm.
    Magnetic properties of 3d impurities in GaAs2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 310, p. 2120-2122Article in journal (Refereed)
  • 3.
    Bergenti, I.
    et al.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    Dediu, V.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    Arisi, E.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    Cavallini, M.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    Biscarini, F.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    Taliani, C.
    ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy.
    de Jong, Michel P
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
    Dennis, C.L.
    Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
    Gregg, J.F.
    Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
    Solzi, M.
    Department of Physics, INFM, Parco Area delle Scienze 7/a, 43100 Parma, Italy.
    Natali, M.
    ICIS CNR, Corso Stati Uniti 4, 35127 Padova, Italy.
    Spin polarized La0.7Sr0.3MnO3 thin films on silicon2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 312, no 2, p. 453-457Article in journal (Refereed)
    Abstract [en]

    La0.7Sr0.3MnO3 polycrystalline manganite thin films were grown on silicon (Si) substrates covered by SiOx amorphous native oxide. Curie temperatures of about 325 K were achieved for 70-nm-thick films. Strong room temperature XMCD signal was detected indicating high spin polarization at the surface. Cross-sectional TEM images show sharp interface between SiOx and manganite without signature of chemical reaction at the interface. Unusual sharp splitting of the manganite film was observed: on the top of a transition layer characterized by low crystalline order, a magnetically robust layer is formed. © 2007 Elsevier B.V. All rights reserved.

  • 4.
    Lundin, U
    et al.
    Univ Uppsala, Dept Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden.
    Sandalov, I
    Univ Uppsala, Dept Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden.
    On the validity region of Fermi-liquid description of 3D strongly correlated systems2001In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 226, p. 241-243Article in journal (Refereed)
    Abstract [en]

    The decay of quasiparticles in systems with strongly correlated electrons (SSCE) is investigated. The difference with normal Fermi-liquid (FL) behavior is caused by kinematic interactions, The latter originate (in SSCE) from hopping and mixing interaction which in normal FL just modify bands, but do not cause a decay. Using a diagram technique we derive the lowest-order contribution giving decay and show how it varies with filling and with the position of the Fermi level with respect to the upper Hubbard's sub-band. Examples are given for a simple-cubic 3D-lattice. Due to spin dependence of the vertex functions a big effect on the lifetime of the quasi-particles due to magnetic fields is expected. A possible experimental realization is discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

  • 5.
    Magnuson, Martin
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Induced magnetism at the interfaces of a Fe/V superlattice investigated by resonant magnetic x-ray scattering2017In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 422, p. 362-366Article in journal (Refereed)
    Abstract [en]

    The induced magnetic moments in the V 3d electronic states of interface atomic layers in a Fe(6ML)/V(7ML) superlattice was investigated by x-ray resonant magnetic scattering. The first V atomic layer next to Fe was found to be strongly antiferromagnetically polarized relatively to Fe and the magnetic moments of the next few atomic layers in the interior V region decay exponentially with increasing distance from the interface, while the magnetic moments of the Fe atomic layers largely remain bulk-like. The induced V moments decay more rapidly as observed by x-ray magnetic scattering than in standard x-ray magnetic circular dichroism. The theoretical description of the induced magnetic atomic layer profile in V was found to strongly rely on the interface roughness within the superlattice period. These results provide new insight into interface magnetism by taking advantage of the enhanced depth sensitivity to the magnetic profile over a certain resonant energy bandwidth in the vicinity of the Bragg angles.

    The full text will be freely available from 2018-09-03 11:32
  • 6.
    Ponomareva, A.V.
    et al.
    Department of Theoretical Physics, Moscow Stt. Inst. of Stl. and Alloys, Leninskii prospect 4, Moscow 119991, Russian Federation.
    Isaev, E.I.
    Department of Theoretical Physics, Moscow Stt. Inst. of Stl. and Alloys, Leninskii prospect 4, Moscow 119991, Russian Federation.
    Pourovskii, L.V.
    Department of Physics, Uppsala University, Uppsala SE-751 21, Sweden, Department of Theoretical Physics, University of Nijmegen, Nijmegen 6500 GL, Netherlands.
    Vekilov, Yu.Kh.
    Department of Theoretical Physics, Moscow Stt. Inst. of Stl. and Alloys, Leninskii prospect 4, Moscow 119991, Russian Federation.
    Johansson, B.
    Department of Physics, Uppsala University, Uppsala SE-751 21, Sweden, Dept. of Mat. Sci. and Engineering, Royal Institute of Technology, Stockholm SE-100 44, Sweden.
    Abrikosov, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
    Ab initio investigations of surface magnetism in V-Mo2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 272-276, p. 1198-1200Article in journal (Refereed)
    Abstract [en]

    Magnetic properties of the (0 0 1) surface of pure vanadium and disordered binary Mo-V alloys have been investigated from the first-principles by means of the LMTO-GF-CPA technique, the fixed spin moment method, and the direct exchange Monte-Carlo statistical mechanics simulations. The binary alloys, as well as pure constituent metals, are nonmagnetic in the bulk. However, we have shown that the (1 0 0) surface of uniformly random and segregated Mo-V alloys is magnetic. The magnetism of the V monolayer on the Mo(0 0 1) surface has also been studied. In particular, the surface relaxation effect has resulted in a reduction of the magnetic moments for V atoms, but the surface magnetism is still present in the system. Including of semi-core states as valence ones does not alter this conclusion. © 2004 Elsevier B.V. All rights reserved.

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