Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules
文献类型：期刊论文
| 作者 | X. G. Liu ; S. W. Or ; B. Li ; Z. Q. Ou ; L. Zhang ; Q. Zhang ; D. Y. Geng ; F. Yang ; D. Li ; E. Bruck ; Z. D. Zhang |
| 刊名 | Journal of Nanoparticle Research
 |
| 出版日期 | 2011 |
| 卷号 | 13期号:3页码:1163-1174 |
| 关键词 | Nanoparticles Magnetic properties Size effect Rare-earth metals films dysprosium carbon gd |
| ISSN号 | 1388-0764 |
| 中文摘要 | Dy(2)O(3)-coated Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules, with Dy cores with the average size of 3.6 and 17.6 nm, respectively, are synthesized by arc-discharge technique. The transition from ferromagnetism to antiferromagnetism absents in the Dy nanoparticles, due to that its average core size of 3.6 nm is smaller than the helix period of Dy. The temperature of the superparamagnetism-antiferromagnetism transition in the Dy nanocapsules increases abnormally to 105 K, while the N,el temperature decreases to 150 K. The magnetic-entropy change (-a dagger S (m)) of the Dy nanoparticles rapidly increases with decreasing temperature. For Al(2)O(3)-coated Dy nanocapsules, -a dagger S (m) reaches 15.2 J kg(-1) K(-1) at 7.5 K, due to the existence of superparamagnetism, and a peak (5.2 J kg(-1) K(-1)) appears at 105 K due to the superparamgantism-antiferromagnetism transition, and -a dagger S (m) exceeds 2 J kg(-1) K(-1) in the temperature range from 7.5 to 105 K, for a field change from 1 to 5 T. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/30547]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | X. G. Liu,S. W. Or,B. Li,et al. Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules[J]. Journal of Nanoparticle Research,2011,13(3):1163-1174. |
| APA | X. G. Liu.,S. W. Or.,B. Li.,Z. Q. Ou.,L. Zhang.,...&Z. D. Zhang.(2011).Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules.Journal of Nanoparticle Research,13(3),1163-1174. |
| MLA | X. G. Liu,et al."Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules".Journal of Nanoparticle Research 13.3(2011):1163-1174. |
入库方式： OAI收割
来源：金属研究所
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