Wu, Chun-Ming and Li, Chi-Yen and Kuo, Yen-Ting and Wang, Chin-Wei and Wu, Sheng-Yun and Li, Wen-Hsien (2009) Quantum spins in Mackay icosahedral gold nanoparticles. Journal of Nanoparticle Research, 12 (1). pp. 177-185.
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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 μB per particle. The unpaired spins behave as J = 1/2 quantum spins. The average level separation is found to be a factor of ~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.
|Uncontrolled Keywords:||Au nanoparticles - Quantum spin - Synthesis - Ferrimagnetism|
|Subjects:||Physical Science > Quantum phenomena|
Material Science > Nanostructured materials
|Deposited On:||12 Feb 2010 16:46|
|Last Modified:||12 Feb 2010 16:46|
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