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Magnetic Properties of the Hf _{1 - x} R_{x} Fe _{6} Ge _{6} ( {R}={\rm Gd} and Dy) Compounds

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4 Author(s)
Rubin, J. ; Inst. de Cienc. de Mater. de Aragon, CSIC-Univ. of Zaragoza, Zaragoza ; Piquer, Cristina ; Bartolome, Juan ; Grandjean, F.

We present a study of the magnetic properties and the 57Fe Mossbauer spectra of the Hf1-x R xFe6Ge6, R = Gd and Dy, series. The macroscopic magnetic measurements are consistent with the magnetic independence of the R and Fe sublattices. However, the 57Fe Mossbauer study reveals a more complex magnetic behavior. Specifically, below T t ap 100 K a spin reorientation takes place in HfFe6 Ge6 . The analysis of the corresponding Mossbauer spectra shows that below T t a fraction of the iron moments is canted from the c-axis. The substitution of Hf by Gd or Dy reduces the fraction of canted iron moments. The hyperfine magnetic fields are found to decrease upon the R = Gd or Dy substitution. This effect can be qualitatively explained as a result of the decrease in the hybridization between the d valence states of the R element with the 3d iron states.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )

Date of Publication:

Nov. 2008

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