Dipolar contributions to magnetic hyperfine fields in ErxY1−xFe2 and TbxY1−xFe2 compounds

Dariel, M.P.; Atzmony, U.; Lebenbaum, D.

doi:10.1002/pssb.2220590229

Cited by 28 publications

(6 citation statements)

References 6 publications

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“…Moreover, it was assumed that all subspectra originated by the random distribution of Fe and Co atoms can be ascribed to the [1 1 1] direction of the easy seen that for Tb 0.27 Dy 0.73 (Fe 0.1 Co 0.9 ) 2 with k = 6 cobalt atoms as nearest neighbours there is no magnetic hyperfine interaction at the studied iron nuclei and only the quadrupole doublet is observed. The problem of fitting this kind of complex Mössbauer spectra is described elsewhere [29,[31][32][33][34][35].…”

Section: Spectra and Analysismentioning

confidence: 99%

Mössbauer effect studies of Tb0.27Dy0.73(Fe1−x Co x )2 intermetallics at 295 K

et al. 2010

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The synthesis of materials and the studies of crystal structure and 57 Fe Mössbauer effect were performed for Tb0.27Dy0.73(Fe1−xCox)2 intermetallics. Terfenol-D (Tb 0.27Dy0.73Fe2) is the starting compound of this Fe/Co-substituted series. X-ray measurements showed evidence of a pure cubic Laves phase C15, MgCu2-type, and unit cell parameters were determined across the series. A Co substitution introduced local area, at sub-nanoscale, with random Fe/Co neighbourhoods of the 57 Fe atoms.Mössbauer effect spectra for the Tb 0.27Dy0.73(Fe1−xCox)2 series at room temperature are composed of a number of locally originated subspectra due to the random distribution of Fe and Co atoms in the transition metal sublattice, and due to [1 1 1] an easy axis of magnetization. Isomer shift, magnetic hyperfine field and quadrupole interaction parameter were obtained from the spectra, both for the local area and for the bulk sample.As a result of Fe/Co substitution, a Slater-Pauling-type curve for the average magnetic hyperfine field vs. Co content was observed. It was found that the magnetic hyperfine fields corresponding to the local area also create a dependence of the Slater-Pauling-type vs. Co contribution in the Fe/Co neighbourhoods.

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Section: Spectra and Analysismentioning

confidence: 99%

Mössbauer effect studies of Tb0.27Dy0.73(Fe1−x Co x )2 intermetallics at 295 K

et al. 2010

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“…Nevertheless the distinctions remain larger than those obtained from dipole field calculations. A similar explanation to that given for (Y, Er)Fe2 and (Y, Tb)Fe, seems not to be possible [17].…”

Section: Resultsmentioning

confidence: 52%

“…On the other hand, for a defined site H(i'S) can be assumed to be constant. From the surrounding atoms a dipole field, determining partly H t ) , results [17] and can be calculated from…”

Section: ( H F ) ) and An Anisotropic Part (Hf)) [17]mentioning

confidence: 99%

Hyperfine interactions in Y2Fe17

Steiner

Haferl

1977

Phys. Stat. Sol. (a)

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Mossbauer measurements are performed on rhombohedral Y,F17 in the temperature range 5 to 300 K and in fields up to 20 kOe. The dipole fields and the crystalline electric field gradients are calculated for both structure types. From this a subdivision of the four crystallographically non-equivalent lattice sites into seven (eight) groups for the Th,Zn17 (Th,Ni,,) compounds is concluded, by neglecting all contributions of the asymmetry parameter. An exact allocation of the resulting subspectra to these different Fe sites is only possible for the c (f)-and a fraction of the d (g)-sites. The field and the temperature dependence of the hyperfine interactions of the distinguishable Fe sites are discussed.

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“…During the fitting procedure, it was assumed that the starting amplitudes A(n 2 ) and thus the weights of subspectra: W(n 2 ) = A(n 2 )/ΣA(n k ) follow the probabilities P(n 2 ). Sometimes it is important to consider also the direction of the [1 1 1] easy axis of magnetization during the fitting procedure, which introduces additional complexity of spectra [26][27][28][29]. After a number of different fitting trials, the simpler case, the [1 0 0] easy axis of magnetization was assumed to exist for all the subspectra [26].…”

Section: Spectra and Analysismentioning

confidence: 99%