Intrinsic magnetic moments of gold nanoparticles

Chi Yen Li, Chun Ming Wu, Sunil K. Karna, Chin Wei Wang, Daniel Hsu, Chih Jen Wang, Wen Hsien Li

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this study the intrinsic magnetic moments developed in 4 nm bare fcc Au nanoparticles were investigated. The magnetization curves reveal a Langevin magnetic field profile, reflecting the existence of spontaneous magnetic moments. Neutron diffraction measurements detect a ferromagnetic moment. The magnetic diffraction patterns are consistent with a moment of μZ=0.14 μB points in the crystallographic [111] direction at 5 K. Magnetostatic interparticle interactions weaken the localized magnetic moments but enhance the conduction electron density. These behaviors can be understood by considering the merging of the 5d and 6s electron bands triggered by finite-size effects and the lifting of band mixture by interparticle interactions.

Original languageEnglish
Article number174446
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number17
DOIs
StatePublished - 31 May 2011

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