High-Field Magnetization Study of $$R_{2}\hbox {Fe}_{17}\hbox {N}_{2}$$ R 2 Fe 17 N 2 ( $$R = \hbox {Ho}$$ R = Ho and Er) Nitrides
| Autor: | I. A. Pelevin, A. A. Salamova, I. S. Tereshina, Mathias Doerr, J. M. Law, E.A. Tereshina-Chitrova, V. N. Verbetski |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Exchange interaction 02 engineering and technology Crystal structure Nitride Type (model theory) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Delta-v (physics) Magnetization Crystallography Ferromagnetism 0103 physical sciences General Materials Science High field 0210 nano-technology |
| Zdroj: | Journal of Low Temperature Physics. 190:236-243 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-017-1838-3 |
| Popis: | The structure and magnetic properties of the nitrided compounds $$R_{2}\hbox {Fe}_{17}\hbox {N}_{2}$$ ( $$R = \hbox {Ho}$$ and Er) are studied. The type of crystal structure $$\hbox {Th}_{2}\hbox {Ni}_{17}$$ is preserved upon nitrogenation, and the relative unit cell volume $$\Delta V{/}V$$ increase exceeds 6%. Magnetic studies are performed in fields up to 60 T at 4.2 K on aligned powder samples. Field-induced spin-reorientation (SR) transitions are observed in the M(H) curves of $$R_{2}\hbox {Fe}_{17}\hbox {N}_{2}$$ . Unlike the parent $$R_{2}\hbox {Fe}_{17}$$ compounds, where the magnetization increases in steps as the field grows stronger, $$R_{2}\hbox {Fe}_{17}\hbox {N}_{2}$$ demonstrate a gradual increase in magnetization. It is indicative of the change of the SR transition from first to the second type. Extrapolation of magnetization curves to the theoretical value of magnetization in the forced ferromagnetic state yields the coefficient of the inter-sublattice R–Fe exchange interaction. The inter-sublattice exchange is found to decrease upon nitrogenation. |
| Databáze: | OpenAIRE |
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