Quantum spins in Mackay icosahedral gold nanoparticles

Chun Ming Wu, Chi Yen Li, Yen Ting Kuo, Chin Wei Wang, Sheng Yun Wu, Wen Hsien Li

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

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.

Original languageEnglish
Pages (from-to)177-185
Number of pages9
JournalJournal of Nanoparticle Research
Volume12
Issue number1
DOIs
StatePublished - Jan 2010

Keywords

  • Au nanoparticles
  • Ferrimagnetism
  • Quantum spin
  • Synthesis

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