高分子保護金ナノ粒子における表面磁気偏極の直接観測  [in Japanese] Direct Observation of the Surface Spin Polarization in Au Nanoparticles Protected by Polymers  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 山本 良之 YAMAMOTO Yoshiyuki
    • 北陸先端科学技術大学院大学材料科学研究科 School of Materials Science, Japan Advanced Institute of Science and Technology
    • 堀 秀信 HORI Hidenobu
    • 北陸先端科学技術大学院大学材料科学研究科 School of Materials Science, Japan Advanced Institute of Science and Technology

Abstract

Superparamagnetic behavior of gold nanoparticles which are less than 3 nm in diameter and stabilized by polymers has been reported, although the bulk gold metal has non-magnetic (diamagnetic) properties. However, this observation is somewhat ambiguous because conventional magnetometry may include magnetization from trivial origins such as magnetic impurities. Therefore, it is essential to selectively measure the magnetization of gold atoms to prove that their magnetism is intrinsic. We have performed the element specific magnetization measurement for Au nanoparticles with a mean diameter of 1.9 nm using X-ray magnetic circular dichroism (XMCD). Magnetization of gold atoms estimated by XMCD shows a good agreement with the results obtained by conventional magnetometory and consist of a superparamagnetic part and a Pauli-paramagnetic part. The mixture of these component is reasonably explained by the picture that the surface atoms are ferromagnetic and the core atoms are Pauli-paramagnetic.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 26(10), 617-622, 2005

    The Surface Science Society of Japan

Cited by:  1

Codes

  • NII Article ID (NAID)
    130004784529
  • NII NACSIS-CAT ID (NCID)
    AN00334149
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0388-5321
  • NDL Article ID
    7689534
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-379
  • Data Source
    CJPref  NDL  J-STAGE 
Page Top