Magnetic properties of ErFe6Fa6 studied by magnetization and neutron diffraction |
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| Authors: | K Prokes RT Gramsma Y Janssen E Brück KHJ Buschow FR de Boer |
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| Institution: | (1) Hahn-Meitner-Institute, SF-2, Glienickerstrasse 100, 141 09 Berlin, Germany, DE;(2) Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands, NL |
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| Abstract: | Neutron-diffraction experiments reveal that ErFe6Ga6 forms in the tetragonal ThMn12-type of structure (space group I4/mmm). The Fe sublattice orders ferromagnetically below K. The Er moments order antiparallel to the Fe moments which, below about 250 K, leads to a decrease of the total magnetization.
The easy magnetization direction of ErFe6Ga6 is perpendicular to the c-axis in the whole temperature range. Refinement at 2 K shows that ErFe6Ga6 orders ferrimagnetically with Er moments of 8.5 (2) and Fe moments at the 8(j) site of 1.9 (1) and at the 8(f) site of 1.7 (1) , respectively. At room temperature, ErFe6Ga6 exhibits the same type of magnetic order, however with substantially lower Er moments of 1.0 (4) and Fe moments at the 8(f) site of 1.2 (2) . The Fe moments at the 8(j) site amount to 1.9 (5) /Fe.
Received 24 November 1999 and Received in final form 27 March 2000 |
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| Keywords: | PACS 75 50 Gg Ferrimagnetics – 75 30 Gw Magnetic anisotropy – 75 25 +z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies synchrotron-source x-ray scattering etc ) |
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