Structure and magnetic properties of Gd2Co17-xSix compounds

被引:25
作者
Wei, XZ
Hu, SJ
Zeng, DC
Liu, ZY
Brück, E
Klaasse, JCP
de Boer, FR
Buschow, KHJ [1 ]
机构
[1] Univ Amsterdam, VanderWaals Zeeman Inst, NL-1012 WX Amsterdam, Netherlands
[2] S China Univ Technol, Guangzhou, Peoples R China
来源
PHYSICA B | 1999年 / 266卷 / 04期
基金
中国国家自然科学基金;
关键词
gadolinium cobalt silicides; magnetic anisotropy; spin reorientation; magnetic moment; Curie temperature;
D O I
10.1016/S0921-4526(99)00067-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The Gd2Co17-xSix compounds have the rhombohedral Th2Zn17 structure and form for 0 less than or equal to x less than or equal to 3. The compounds with 0 less than or equal to x less than or equal to 0.3 have an easy magnetisation direction parallel to the c axis only at high temperatures. The spin reorientation temperature, leading to a state with easy magnetisation direction perpendicular to the c axis, decreases strongly with increasing Si concentration. The spin reorientation in Gd2Co17 takes place at 940 K, which is substantially lower than that reported previously for Ho2Co17. The componds with 1 less than or equal to x less than or equal to 3 have an easy magnetisation direction parallel to the c axis at all temperatures. The Co moments and the Curie temperatures decrease strongly with increasing Si concentration. We also determined the values of the anisotropy constant K-1 which change from negative to positive around x = 0.7. This behaviour is discussed in terms of preferential Si substitution. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:249 / 255
页数:7
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