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  • 1. Andreeva, M. A.
    et al.
    Lindgren, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Nuclear resonant spectroscopy at Bragg reflections from periodic multilayers: Basic effects and applications2005In: Phys. Rev. B, Vol. 72, p. 125433-Article in journal (Refereed)
  • 2. Andreeva, M. A.
    et al.
    Monina, N. G.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Häggström, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Kalska, Beata
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Magnetic ordering in a [Fe/Co](35) BCC film studied by nuclear resonant reflectometry2007In: Journal of Experimental and Theoretical Physics, ISSN 1063-7761, E-ISSN 1090-6509, Vol. 104, no 4, p. 577-585Article in journal (Refereed)
    Abstract [en]

    An analysis of the angular dependences of nuclear resonant reflectivity time spectra for different models of magnetic ordering in films reveals an ambiguity in the magnetization direction determined from spectra measured at one orientation of the sample. This analysis explains features in the spectra of the nuclear resonant reflectivity from a MgO/[Fe(6 ML)/Co(3 ML)]35/V (1 nm) film measured before and after sample rotation by 90° about the normal to the surface. It is shown that the spectrum measured only at one orientation of the sample determines only the effective azimuth angle of magnetization γeff. This does not exclude the occurrence of a domain structure, while the angle γeff does not correspond to the true direction of the preferred orientation of magnetization. The results of measurements at two orientations of the sample can be satisfactorily matched using a model that considers a coherent mixture of states with magnetization directed along the 〈110〉 axis (77%) and with a chaotic orientation of the magnetic hyperfine field B hf in the film plane for the other nuclei.

  • 3. Andreeva, M. A.
    et al.
    Monina, N.G.
    Häggström, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Materials Physics.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Materials Physics.
    Kalska, B.
    Kamali, M
    Vdovichev, S. N
    Salashchenko, N. N.
    Semenov, V. G
    Leupold, O
    Rüffer, R
    Nuclear resonant reflectivity with standing waves for the investigation of a thin 57Fe layer buried inside a superconducting Si/[Mo/Si]45/57Fe/Nb multilayer2008In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 1, p. 187-196Article in journal (Refereed)
    Abstract [en]

    A special multilayer sample Si/[Mo/Si]45/57Fe/Nb has been prepared for the depth selective investigations of the hyperfine fields in thin iron layer at low temperatures above and below the superconducting transition in the top Nb layer (Tc 8 K) by means of the nuclear resonant reflectivity with standing waves. The periodic multilayer [Mo/Si]45 below the iron layer in our sample was used as “a standing wave generator”. A weak magnetic hyperfine splitting in the 57Fe layer was detected just at low temperature. A slight variation of the nuclear resonant reflectivity time spectra measured above and below Tc was observed. At first it was supposed that this change of the spectrum shape is caused by the spatial modulation of ferromagnetic domains in the 57Fe layer caused by a proximity effect. A closer analysis, however, reveals that the spectrum variations are due to just the changes of the relative weights of the magnetic and paramagnetic phases in 57Fe layer.

  • 4. Andreeva, M. A.
    et al.
    Smekhova, A. G.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Björck, Matts
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Andersson, Gabriella
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Depth selective investigations of magnetic multilayers by X-ray resonant magnetic reflectivity2006In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 300, no 1, p. e371-e374Article in journal (Refereed)
    Abstract [en]

    We have measured and analyzed the X-ray resonant Bragg reflectivity spectra from BCC [Fe/Co]n superstructure near the L2,3 absorption edges of iron. The developed general computer code for the reflectivity calculations from arbitrary anisotropic multilayers allows us to test the different approaches to the treatment of the Bragg reflectivity spectra. We have proved that the observed asymmetry of the spectrum shape at the first-order Bragg peak for the right and left circular polarizations is predominantly caused by the magnetization of the central part of iron layers. The influence of interfaces is almost negligible. The fit of the energy dependence of the integral intensity of the Bragg reflection for the [Fe6/Co6]50 sample gives the value of the magnetic moment of Fe atoms in the central parts of Fe layers ∼2.6 μB, that is larger than the volume value.

  • 5.
    Andreeva, M.A.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Häggström, Lennart
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Lindgren, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Kalska, Beata
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Blixt, Anna-Maria
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Kamali-Moghaddan, Saaed
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III.
    Nuclear resonant reflectivity investigations of a thin magnetic 57Fe layer adjacent to a superconducting V layer2004In: Hyperfine Interactions, Vol. 156/157, p. 607-Article in journal (Refereed)
  • 6. Andreeva, Marina A
    et al.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Standing Waves and Reflectivity from an Ultrathin Layer2002In: JETP Letters, Vol. 76, no 12, p. 704-706Article in journal (Refereed)
  • 7.
    Andreeva, Marina.A
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Semenov, V.G
    Lindgren, Bengt
    Häggström, Lennart
    Kalska, Beata
    Chumakov, A.I
    Leupold, O
    Rüffer, R
    Prokhorov, K.A
    Salashchenko, N.N
    Interface sensitive investigation of 57Fe/Cr superstructure by means of nuclear resonance standing waves in time scale.2002In: Hyperfine Interactions, ISSN 0304-3843, Vol. 141, no 1-4, p. 119-123Article in journal (Other academic)
    Abstract [en]

    With synchrotron pulsed radiation we have measured the time spectra of reflectivity for several grazing angles in vicinity of the Bragg peak for a microcrystalline periodical (Fe/Cr)(26) multilayer. In such a way a "scan" of hyperfine field distribution o

  • 8.
    Björck, Matts
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Andersson, Gabriella
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Wäppling, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Stanciu, Victor
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Element-specific magnetic moment profile in BCC Fe/Co superlattices2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 284, p. 273-280Article in journal (Refereed)
    Abstract [en]

    BCC Fe/Co superlattices with individual layer thicknesses in the range of 2–9 monolayers have been investigated byX-ray magnetic circular dichroism in combination with SQUID magnetometry in order to study the magnetic momentdistribution in the superlattices. The magnetic moment for Co was found to remain constant, within 0:1 mB=atom, at1:6 mB=atom for all the superlattices. The Fe atoms at the interface have an enhanced moment of about 3:0 mB=atom. Inaddition, a complex dependence of the size of the moments on the thickness of the Fe layer was found and attributed tointerface roughness effects. Element-specific hysteresis curves were also recorded. These measurements show that themagnetic moments of Fe and Co were, as expected, coupled during reversal of the magnetic moment direction.

  • 9.
    Kalska, Beata
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Häggström, Lennart
    Lindgren, Bengt
    Blomquist, Peter
    Wäppling, Roger
    Andreeva, Marina.A
    Nikitenko, Yu.V
    Proglyado, V.V
    Aksenov, V.L
    Semenov, V.G
    Schumakov, A.I
    Leupold, O
    Rüffer, R
    Magnetic properties of monocrystal 57FeV multilayers investigated by CEMS, Nuclear Resonance Reflectivity in the Time Domain and Polarized Neutron Scattering2001In: Hyperfine Interactions, Vol. 136/137, no 295Article in journal (Other academic)
  • 10.
    Lindgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    EFGs on Surfaces – Experiment and Theory2002In: Z. Naturforschung 57a (2002) 544., Vol. 57a, p. 544-556Article in journal (Refereed)
1 - 10 of 10
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