Quantum spins in Mackay icosahedral gold nanoparticles

被引:25
作者
Wu, Chun-Ming [1 ]
Li, Chi-Yen [1 ]
Kuo, Yen-Ting [1 ]
Wang, Chin-Wei [1 ]
Wu, Sheng-Yun [2 ]
Li, Wen-Hsien [1 ]
机构
[1] Natl Cent Univ, Dept Phys, Jhongli 32001, Taiwan
[2] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan
关键词
Au nanoparticles; Quantum spin; Synthesis; Ferrimagnetism; PARTICLES;
D O I
10.1007/s11051-009-9592-3
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report on the direct observation of the intrinsic magnetization behavior of Mackay icosahedral Au nanoparticles. The spin arrangements in 3.5-nm icosahedral Au particles are found to be ferrimagnetic-like, where the core and surface moments point in opposite directions, with a net spontaneous magnetic moment of 16 mu(B) per particle. The unpaired spins behave as J = 1/2 quantum spins. The average level separation is found to be a factor of similar to 1.53 larger than that estimated according to the Kubo formula for spherical Au particles. This reflects the fact that there are considerably fewer atoms packed in a particle with an icosahedral geometry than with a spherical one.
引用
收藏
页码:177 / 185
页数:9
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