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Träfflista för sökning "WFRF:(Persson Olof P) srt2:(2015-2019)"

Sökning: WFRF:(Persson Olof P) > (2015-2019)

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1.
  • Ahlén, Olof, et al. (författare)
  • Fourier coefficients attached to small automorphic representations of SLn (A)
  • 2018
  • Ingår i: Journal of Number Theory. - : Elsevier BV. - 0022-314X .- 1096-1658. ; 192, s. 80-142
  • Tidskriftsartikel (refereegranskat)abstract
    • We show that Fourier coefficients of automorphic forms attached to minimal or next-to-minimal automorphic representations of SLn(A) are completely determined by certain highly degenerate Whittaker coefficients. We give an explicit formula for the Fourier expansion, analogously to the Piatetski-Shapiro–Shalika formula. In addition, we derive expressions for Fourier coefficients associated to all maximal parabolic subgroups. These results have potential applications for scattering amplitudes in string theory.
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2.
  • Mukherjee, S., et al. (författare)
  • Role of boron diffusion in CoFeB/MgO magnetic tunnel junctions
  • 2015
  • Ingår i: Physical Review B. - 1098-0121 .- 1550-235X. ; 91:8
  • Tidskriftsartikel (refereegranskat)abstract
    • Several scientific issues concerning the latest generation read heads for magnetic storage devices, based on CoFeB/MgO/CoFeBmagnetic tunnel junctions (MTJs) are known to be controversial, including such fundamental questions as to the behavior and the role of B in optimizing the physical properties of these devices. Quantitatively establishing the internal structures of several such devices with different annealing conditions using hard x-ray photoelectron spectroscopy, we resolve these controversies and establish that the B diffusion is controlled by the capping Ta layer, though Ta is physically separated from the layer with B by several nanometers. While explaining this unusual phenomenon, we also provide insight into why the tunneling magnetoresistance (TMR) is optimized at an intermediate annealing temperature, relating it to B diffusion, coupled with our studies based on x-ray diffraction and magnetic studies.
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