Direct observation of ferromagnetic spin polarization in gold nanoparticles

Y. Yamamoto, T. Miura, M. Suzuki, N. Kawamura, H. Miyagawa, T. Nakamura, K. Kobayashi, T. Teranishi, H. Hori

Research output: Contribution to journalArticlepeer-review

279 Citations (Scopus)

Abstract

The observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using magnetic circular dichroism (XMCD) was presented. The gold magnetization was explored, owing to the element selectivity of XMCD. It was observed that the magnetization of gold atoms, estimated by XMCD, shows a good agreement with results obtained by conventional magnetometry. It was found that the magnetization of Au nanoparticles consist of a superparamagnetic part obeying the Curie law and a temperature-independent Pauli-paramagnetic part, suggested by the external magnetic field and temperature dependence of the element-specific magnetization (ESM) signal.

Original languageEnglish
Article number116801
Pages (from-to)116801-1-116801-4
JournalPhysical review letters
Volume93
Issue number11
DOIs
Publication statusPublished - 2004 Sep 10
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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