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Sökning: WFRF:(Yang H) > Högskolan i Halmstad

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1.
  • 2019
  • Tidskriftsartikel (refereegranskat)
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2.
  • Kristiansson, P., et al. (författare)
  • Optical dot gain on newsprint determined with the Lund nuclear microprobe
  • 1997
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - Amsterdam : Elsevier. - 0168-583X .- 1872-9584. ; 130:1-4, s. 303-307
  • Tidskriftsartikel (refereegranskat)abstract
    • A technique for measuring optical dot gain, i.e. the relative difference between the actual screen dot and the optically perceived one, is presented. By combining measurements from the non-optical nuclear microprobe with data from image analyzing technique the optical dot gain can be determined. The procedure to reach pixel by pixel correlation on a micrometer scale is discussed. In the newsprint sample studied in this investigation a typical optical dot gain between 15 and 20% was deduced. The variation in the optical dot gain was correlated with other characteristic parameters of the print and newsprint and especially a positive correlation to the mass density of the newsprint was observed. (C) 1997 Elsevier Science Ltd.
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3.
  • Yang, Kexin, et al. (författare)
  • Magneto-optic response of the metallic antiferromagnet Fe2As to ultrafast temperature excursions
  • 2019
  • Ingår i: Physical Review Materials. - : AMER PHYSICAL SOC. - 2475-9953. ; 3:12
  • Tidskriftsartikel (refereegranskat)abstract
    • The linear magneto-optic Kerr effect (MOKE) is often used to probe magnetism of ferromagnetic materials, but MOKE cannot be applied to collinear antiferromagnets due to the cancellation of sublattice magnetization. Magneto-optic constants that are quadratic in magnetization, however, provide an approach for studying antiferromagnets on picosecond timescales. Here, we combine transient measurements of linear birefringence and optical reflectivity to study the optical response of Fe2As to small ultrafast temperature excursions. We performed temperature-dependent pump-probe measurements on crystallographically isotropic (001) and anisotropic (010) faces of Fe2As bulk crystals. We find that the largest optical signals arise from changes in the index of refraction along the z axis, perpendicular to the Ned vector. Both real and imaginary parts of the transient optical birefringence signal approximately follow the temperature dependence of the magnetic heat capacity, as expected if the changes in dielectric function are dominated by contributions of exchange interactions to the dielectric function.
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