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

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2010年 / 12卷 / 01期

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

页码：177 / 185

页数：9

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