The magnetic properties of Gd{sub 2}Co{sub 17{minus}x}Ga{sub x} compounds

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365757· OSTI ID:542546

Liang, B; Shen, B; Wang, F; Zhao, T; Cheng, Z; Zhang, S; Gong, H; Zhan, W ^[1]

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1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, Peoples Republic of (China)

X-ray diffraction (XRD) and magnetization measurements were performed to investigate the effect of Ga substitution for Co on the structural and magnetic properties of Gd{sub 2}Co{sub 17{minus}x}Ga{sub x} compounds (x=0, 1, 2, 3, 4, 5, 6, 7, and 8). Crystal-structure studies indicate that all samples are single phase with the rhombohedral Th{sub 2}Zn{sub 17}-type structure except for the samples with x=7 and 8, which contain a small amount of Co. The Ga substitution for Co in Gd{sub 2}Co{sub 17} compounds leads to a monotonic increase in the unit cell volume and an approximately linear decrease in the saturation magnetization. The Curie temperature T{sub C} is found to decrease monotonically from 1210 K for x=0 to 30 K for x=8. The compensation points are observed for the Gd{sub 2}Co{sub 17{minus}x}Ga{sub x} samples with x=5 and 6. The value of the compensation temperature, determined from the temperature dependence of the magnetization measured in a magnetic field of 1000 Oe, is 120 and 152 K for x=5 and 6, respectively. It is noteworthy that the substitution of Ga for Co in the Gd{sub 2}Co{sub 17} compounds has a remarkable influence on the magnetocrystalline anisotropy. XRD studies on magnetic-field oriented Gd{sub 2}Co{sub 17{minus}x}Ga{sub x} powders show that the sample with x=0 exhibits an easy-plane anisotropy, while the samples with x{ge}1 exhibit an easy c-axis anisotropy at room temperature. The change of the easy magnetization direction of Gd{sub 2}Co{sub 17{minus}x}Ga{sub x} compounds from a basal plane to c axis indicates that the substitution of Ga for Co leads to the decrease of the planar anisotropy of the Co sublattice. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 542546
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
CRYSTAL STRUCTURE
CURIE POINT
GADOLINIUM ALLOYS
GALLIUM ALLOYS
MAGNETIZATION
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION