ACTA

Influence of Carbon on Spin Reorientation Processes in Er_2-xR_xFe₁₄C (R = Gd, Pr) - Mössbauer and Magnetometric Studies

A.T. Pędziwiatr^a, K. Krawiec^a, B.F. Bogacz^a, Cz. Kapusta^b, J. Przewoźnik^b, D. Kaczorowski^c and E. Talik^d
^aM. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
^bAGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
^cW. Trzebiatowski Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland
^dA. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

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The Er_2-xR_xFe₁₄C (R=Gd, Pr) polycrystalline compounds have been synthesized and investigated with ⁵⁷Fe Mössbauer spectroscopy and magnetic measurements. The spin reorientation phenomena were studied extensively by narrow step temperature scanning in the neighborhood of the spin reorientation temperature. Obtained Mössbauer spectra were analyzed using a procedure of simultaneous fitting and the transmission integral approach. Consistent description of Mössbauer spectra were obtained, temperature and composition dependencies of hyperfine interaction parameters and subspectra contributions were derived from fits and the transition temperatures were determined for all the compounds studied. Initial magnetization versus temperature measurements (in zero and non-zero external field) for Er_2-xGd_xFe₁₄C compounds allowed to establish the temperature regions of reorientation, change of magnetization value during the transition process. The results obtained with different methods were analyzed and the spin arrangement diagrams were constructed. Data obtained for Er_2-xGd_xFe₁₄C were compared with those for Er_2-xGd_xFe₁₄B series.

DOI: 10.12693/APhysPolA.119.48
PACS numbers: 76.80.+y, 75.25.-j, 75.50.-y, 75.50.Bb