How Gold nanoparticle acquires magnetism? - Formation of large orbital moment at the interface

Details How Gold nanoparticle acquires magnetism? - Formation of large orbital moment at the interface How Gold nanoparticle acquires magnetism? - Formation of large orbital moment at the interface

2009-12-17

arxiv.org/abs/0912.3319v2

Physics

Condensed Matter

Materials Science

7 pages double column, 6 figures, This manuscript contains more quantitative analysis of magnetization of arXiv:0906.1497v2 an

Scientific paper

In this paper, we have tried to find out the origin of magnetism in Gold nanoparticles (Au- NPs). We observe that upon incorporating Gold nanoparticles (Au-NPs) in Fe3O4 nanoparticle medium the net magnetisation increases compared to the pure Fe3O4 nanoparticle medium. This increase of magnetization can be attributed to the large orbital magnetic moment formation at the Au/magnetic particle interface indicating that magnetism observed in Au-NPs is an interfacial effect. This interfacial effect has been supported by the observation of sudden transition from positive saturated magnetisation to a negative diamagnetic contribution as a function of magnetic field on citrate coated gold Au-NPs.

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