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Träfflista för sökning "WFRF:(Mathieu D) srt2:(2000-2004)"

Sökning: WFRF:(Mathieu D) > (2000-2004)

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  • Mathieu, R, et al. (författare)
  • Magnetization of ultrathin (Ga,Mn)As layers
  • 2003
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 68:18: 184421
  • Tidskriftsartikel (refereegranskat)abstract
    • Kerr rotation and superconducting quantum interference device magnetometry measurements were performed on ultrathin (Ga0.95Mn0.05)As layers. The thinner layers (below 250 A) exhibit magnetic properties different than those of thicker ones, associated with different microstructure, and some degree of inhomogeneity. The temperature dependence of the field-cooled magnetization of the layers is recorded after successive low temperature annealings. While the Curie temperature of the thicker layer (250 A) is nearly unchanged, the critical temperature of the thinner layers is enhanced by more than 23 K after two annealings. Secondary ion mass spectrometry experiments on similar layers show that Mn is displaced upon annealing. The results are discussed considering a possible segregation of substitutional and interstitial Mn atoms at the surface of the (Ga,Mn)As layers.
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  • Mathieu, R., Sørensen, B.S., Sadowski, J., Södervall, U., Kanski, J., Svedlindh, P., Lindelof, P.E., Hrabovsky, D. and Vanelle, E. (författare)
  • Magnetization of ultrathin (Ga,Mn)As layers
  • 2003
  • Ingår i: Phys. Rev. B 68, 184421 (2003)..
  • Tidskriftsartikel (refereegranskat)
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  • Tseggai, Mehreteab, et al. (författare)
  • Magnesium Substitution in Nd0.7Sr0.3MnO3
  • 2004
  • Ingår i: J. Solid State Chemistry. ; 177, s. 966-971
  • Tidskriftsartikel (refereegranskat)abstract
    • Magnesium substitution in Nd0.7Sr0.3MnO3 has been studied by neutron powder diffraction. Polycrystalline samples of nominal compositions Nd0.7Sr0.3Mn1−yMgyO3 with y=0.0, 0.1, 0.2 and 0.3 were synthesized by the standard solid-state reaction method. Rietveld refinements of the neutron powder diffraction data showed that all samples had distorted perovskite structure of orthorhombic symmetry. Mg initially preferred to substitute for Nd and only at Mg concentration greater than 0.1, a substantial substitution for Mn occurred. Our study also showed that Mg-substitution did not change the crystal structure of Nd0.7Sr0.3MnO3.
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  • Resultat 1-8 av 8

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