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题名: Magnetic ordering and irreversible magnetization between ZFC and FC states in RCo5Ga7 compounds
作者: Chang H;  Guo YQ;  Liang JK;  Rao GH
发表日期: 2004
摘要: The magnetic properties of RCo5Ga7 (R = Y, Tb, Dy, Ho and Er) compounds which crystallize in the ScFe6Ga6-type structure have been studied. The compounds with R, Y, Tb, Dy, Ho and Er display behaviour similar to semiconductors. The Co transition metal sublattice is ferrimagnetic with a very low spontaneous magnetization. The ferrimagnetic ordering observed for R = Y, Tb, Dy, Ho and Er is due to the transition metal sublattice with transition temperatures at about 295 K. At low temperatures, the magnetic ordering for R Tb, Dy, Ho and Er is due to the rare-earth sublattice, which is ferromagnetic with a Curie temperature below 5 K. By fitting the linear part of the inverse magnetization, the effective magnetic moment of the R ion is found to be close to its expected theoretical value, with paramagnetic Curie temperatures below 5 K. Due to the paramagnetic nature of the R sublattice above 60 K, the ferrimagnetic ordering temperature of the Co sublattice does not vary with the type of rare-earth ion. The irreversibility of the magnetization of YCo5Ga7, as measured in zero-field cooled (ZFC) and field cooled (FC) states, is attributed to movement of domain walls. Application of a large enough applied field completes the movement of the domain wall from the low-temperature to the high-temperature one at 5 K. With a very low magnetic field 100 Oe, the difference between the ZFC and the FC shrinks. (C) 2004 Elsevier B.V. All rights reserved.
KOS主题词: Magnetic properties
刊名: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Chang, H; Guo, YQ; Liang, JK; Rao, GH .Magnetic ordering and irreversible magnetization between ZFC and FC states in RCo5Ga7 compounds ,JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,JUL 2004,278 (3):306-310
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