Structure, exchange interactions and magnetic anisotropy of Ho2Co17−xSix compounds

Autor:	Wen-shan Zhan, Shao-ying Zhang, Li-gang Zhang, Jing-yun Wang, Bao-gen Shen
Rok vydání:	2000
Předmět:	Magnetization Magnetic anisotropy Materials science Ferromagnetism Condensed matter physics Exchange interaction Neutron diffraction Intermetallic General Physics and Astronomy Curie temperature equipment and supplies human activities Solid solution
Zdroj:	Journal of Applied Physics. 87:427-431
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.371879
Popis:	The structural and magnetic characteristics of Ho2Co17−xSix (x=0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) compounds have been investigated by means of x-ray diffraction and magnetic measurements. Powder x-ray diffractograms show that all samples are single phase and have the hexagonal Th2Ni17-type or the rhombohedral Th2Zn17-type structure. The substitution of Si for Co leads to a monotonous decrease in unit cell volume v and Curie temperature TC. The compensation points are observed for the samples with x=2.5 and 3.0, and the compensation temperatures shift to higher temperatures with increasing Si content. The intersublattice-molecular-field coefficient, nHo–Co, has been determined on the basis of magnetization curves at the compensation temperature. It has been found that the Si substitution for Co has little influence on Ho–Co exchange interaction. The magnetic phase diagram has been determined from the temperature dependence of magnetization and the XRD patterns of magnetically oriented powder samples. The...
Databáze:	OpenAIRE
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