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Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17

Shen, Bao-gen and Cheng, Zhao-hua and Wang, Fang-wei and Yan, Qi-wei and Ta, Hong and Liang, Bing and Zhang, Shao-ying and Boer, FR De and Buschow, KHJ and Ridwan, Ridwan (1998) Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17. Journal of Applied Physics, 83 (11). pp. 5945-5954.

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A detailed investigation of the structure and magnetic properties of Tm 2 Fe 17−x Ga x Tm2Fe17−xGax (x=0, (x=0, 1, 2, 3, 4, 5, 6, 7, and 8) compounds has been performed by means of x-ray-diffraction, neutron-diffraction, magnetization, and ac-susceptibility measurements. Crystal-structure studies have shown that the prepared samples are single phase with the hexagonal Th 2 Ni 17 Th2Ni17 for x⩽3 x⩽3 and the rhombohedral Th 2 Zn 17 Th2Zn17 structure for x⩾5. x⩾5. In Tm 2 Fe 13 Ga 4 Tm2Fe13Ga4 the Th 2 Zn 17 Th2Zn17 structure coexists with the Th 2 Ni 17 Th2Ni17 structure. Substitution of Ga for Fe in Tm 2 Fe 17 Tm2Fe17 leads to an increase of the unit-cell volume, which is linear with the Ga concentration. In Tm 2 Fe 17−x Ga x , Tm2Fe17−xGax, the saturation magnetization at 1.5 K decreases linearly with increasing Ga content with a rate of 2.3 μ B 2.3 μB per substituted Ga atom. The Curie temperature is found first to increase with increasing Ga content, going through a maximum value of 485 K at about x=3, x=3, then to decrease. Between x=6 x=6 and 7, a minimum value of T C TC is reached and for higher x x values T C TC increases again. X-ray-diffraction measurements on magnetically aligned Tm 2 Fe 17−x Ga x Tm2Fe17−xGax powders show that the compounds with x⩽6 x⩽6 have an easy-plane type of magnetic anisotropy, whereas the compounds with x⩾7 x⩾7 exhibit easy c c -axis anisotropy at room temperature. All Tm 2 Fe 17−x Ga x Tm2Fe17−xGax compounds exhibit a spin-reorientation transition at low temperature, except for the sample with x=6, x=6, which shows an easy-magnetization direction perpendicular to the c c axis in the temperature range from 5 to 300 K. For x⩽5, x⩽5, the spin-reorientation temperature is found first to increase with x x and then to decrease, having a maximum value of 211 K at about x=3. x=3. In the samples with x⩾7, x⩾7, an easy-plane anisotropy was observed at low temperature, but an easy-axis preference of the magnetization at room temperature was observed. The results obtained for Tm2 Fe17−x Gax Tm2Fe17−xGax indicate that the mutually competing Tm- and Fe-sublattice anisotropies both change their sign with increasing Ga concentration.

Item Type: Article
Subjects: Daur Bahan Bakar Nuklir dan Bahan Maju > Bahan Struktur dan Bahan Maju > Teknik Sintesis Bahan Maju
Divisions: Pusat Sains dan Teknologi Bahan Maju
Date Deposited: 29 Nov 2018 00:42
Last Modified: 29 Nov 2018 00:42
URI: http://repo-nkm.batan.go.id/id/eprint/5707

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