Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17

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	Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17
	B. G. Shen; Z. H. Cheng; F. W. Wang; Q. W. Yan; H. Tang; B. Liang; S. Y. Zhang
	1998
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	83 期号:11 页码:5945-5954
摘要	A detailed investigation of the structure and magnetic properties of Tm2Fe17-xGax (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 Th2Ni17 for x less than or equal to 3 and the rhombohedral Th2Zn17 structure for x greater than or equal to 5, In Tm2Fe13Ga4 the Th2Zn17 structure coexists with the Th2Ni17 structure. Substitution of Ga for Fe in Tm2Fe17 leads to an increase of the unit-cell volume, which is linear with the Ga concentration. In Tm2Fe17-xGax, the saturation magnetization at 1.5 K decreases linearly with increasing Ga content with a rate of 2.3 mu(B), 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, then to decrease. Between x = 6 and 7, a minimum value of T-C is reached and for higher x values T-C increases again. X-ray-diffraction measurements on magnetically aligned Tm2Fe17-xGax powders show that the compounds with x less than or equal to 6 have an easy-plane type of magnetic anisotropy, whereas the compounds with x greater than or equal to 7 exhibit easy c-axis anisotropy at room temperature. All Tm2Fe17-xGax compounds exhibit a spin-reorientation transition at low temperature, except for the sample with x = 6, which shows an easy-magnetization direction perpendicular to the c axis in the temperature range from 5 to 300 K. For x less than or equal to 5, the spin-reorientation temperature is found first to increase with x and then to decrease, having a maximum value of 211 K at about x = 3. In the samples with x greater than or equal to 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 Tm2Fe17-xGax indicate that the mutually competing Tm- and Fe-sublattice anisotropies both change their sign with increasing Ga concentration. (C) 1998 American Institute of Physics. [S0021-8979(98)00311-9].
部门归属	chinese acad sci, inst phys, state key lab magnetism, beijing 100080, peoples r china. chinese acad sci, ctr condensed matter phys, beijing 100080, peoples r china. acad sinica, inst met res, shenyang 110015, peoples r china. univ amsterdam, van der waals zeeman inst, nl-1018 xe amsterdam, netherlands. kawasan puspiptek, natl atom energy agcy, math sci res ctr, serpong, tangerang, indonesia.;shen, bg (reprint author), chinese acad sci, inst phys, state key lab magnetism, pob 603, beijing 100080, peoples r china
关键词	Magnetic-properties Neutron-diffraction Solid-solutions r(2)Fe(17-x)Ga(x) Compounds Mossbauer R=y Sm2fe17-xsix Fe-57 Iron Tb
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WOS记录号	WOS:000075257100052
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37763
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	B. G. Shen,Z. H. Cheng,F. W. Wang,et al. Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17[J]. Journal of Applied Physics,1998,83(11):5945-5954.
APA	B. G. Shen.,Z. H. Cheng.,F. W. Wang.,Q. W. Yan.,H. Tang.,...&S. Y. Zhang.(1998).Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17.Journal of Applied Physics,83(11),5945-5954.
MLA	B. G. Shen,et al."Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17".Journal of Applied Physics 83.11(1998):5945-5954.