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Exchange interactions in DyxTm1-xFe10 Si2 compounds

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3 Author(s)
P. Stefanski ; Inst. of Molecular Phys., Acad. of Sci., Poznan, Poland ; A. Kowalczyk ; M. Budzynski

Mossbauer measurements were performed on DyxTm1-x iFe10Si2 samples (x=O, 0.2, 0.4, 0.6, 0.8, 1.0). The hyperfine magnetic fields at 57Fe nuclei were investigated, their changes caused by replacement of Tm by Dy atoms. Measurements were performed in transmission geometry using a constant acceleration Mossbauer spectrometer. The substitution of Tm atoms by the Dy atoms causes an increase of internal magnetic fields. In pure TmFe 10Si2 the hyperfine magnetic fields at 8(i), 8(j) and 8(f) positions are respectively equal to 25.3, 23.0 and 21.2 T. The complete substitution of Tm by Dy gives the average increase of hyperfine magnetic held magnitude equal to 0.6 T. The molecular field approximation was applied to calculate the intra- and intersublattice exchange interactions considering experimental Curie temperatures of the investigated compounds. The calculated exchange coupling constants between rare earth and iron sublattices increase when substituting Tm by Dy

Published in:

IEEE Transactions on Magnetics  (Volume:30 ,  Issue: 2 )