Research Paper

Journal of Nanoparticle Research

, Volume 12, Issue 1, pp 177-185

Quantum spins in Mackay icosahedral gold nanoparticles

  • Chun-Ming WuAffiliated withDepartment of Physics, National Central University
  • , Chi-Yen LiAffiliated withDepartment of Physics, National Central University
  • , Yen-Ting KuoAffiliated withDepartment of Physics, National Central University
  • , Chin-Wei WangAffiliated withDepartment of Physics, National Central University
  • , Sheng-Yun WuAffiliated withDepartment of Physics, National Dong Hwa University
  • , Wen-Hsien LiAffiliated withDepartment of Physics, National Central University Email author 

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Abstract

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.

Keywords

Au nanoparticles Quantum spin Synthesis Ferrimagnetism