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Sökning: WFRF:(Bali Rantej)

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1.
  • Ehrler, Jonathan, et al. (författare)
  • Magneto-structural correlations in a systematically disordered B2 lattice
  • 2020
  • Ingår i: New Journal of Physics. - : IOP PUBLISHING LTD. - 1367-2630. ; 22:7
  • Tidskriftsartikel (refereegranskat)abstract
    • Ferromagnetism in certain B2 ordered alloys such as Fe(60)Al(40)can be switched on, and tuned, via antisite disordering of the atomic arrangement. The disordering is accompanied by a similar to 1 % increase in the lattice parameter. Here we performed a systematic disordering of B2 Fe(60)Al(40)thin films, and obtained correlations between the order parameter (S), lattice parameter (a(0)), and the induced saturation magnetization (M-s). As the lattice is gradually disordered, a critical point occurs at 1 -S= 0.6 anda(0)= 2.91 angstrom, where a sharp increase of theM(s)is observed. DFT calculations suggest that below the critical point the system magnetically behaves as it would still be fully ordered, whereas above, it is largely the increase ofa(0)in the disordered state that determines theM(s). The insights obtained here can be useful for achieving tailored magnetic properties in alloys through disordering.
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2.
  • La Torre, Enrico, et al. (författare)
  • Local probe of irradiation-induced structural changes and orbital magnetism in Fe60Al40 thin films via an order-disorder phase transition
  • 2018
  • Ingår i: Physical Review B. - : AMER PHYSICAL SOC. - 2469-9950 .- 2469-9969. ; 98:2
  • Tidskriftsartikel (refereegranskat)abstract
    • Hard x-ray absorption and magnetic circular dichroism spectroscopy have been applied to study the consequential changes of the local environment around Fe atoms and their orbital polarizations in 40 nm thick Fe60Al40 thin films along the order-disorder (B2 -> A2) phase transition initiated by 20-keV Ne+ ion irradiation with fluences of (0.75-6) x 10(14) ions cm(-2). The analysis of the extended x-ray absorption fine structure spectra measured at the Fe K edge at room temperature revealed an increased number of Fe-Fe nearest neighbors from 3.47(7) to 5.0(1) and similar to 1% of volume expansion through the transition. The visualization of the Fe and Al nearest-neighbor rearrangement in the first coordination shell of Fe absorbers via the transition was carried out by wavelet transformations. The obtained changes in Fe coordination are evidently reflected in the x-ray magnetic circular dichroism spectra which show an increased orbital magnetic moment of Fe atoms and a pronounced magnetic multielectronic excitations peak at similar to 60 eV above the edge. The amplitudes of both peaks demonstrated similar dependencies on the irradiation fluence. The results of self-consistent density functional calculations on relaxed Fe60Al40 model structures for the ordered (B2) and the disordered (A2) phases are consistent with the experimental findings and point to the formation of Fe-rich regions in the films studied.
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