Chemically Induced Permanent Magnetism in Au, Ag, and Cu Nanoparticles: Localization of the Magnetism by Element Selective Techniques

详细信息    查看全文

• 作者：José ; S. Garitaonandia ; Maite Insausti ; Eider Goikolea ; Motohiro Suzuki ; John D. Cashion ; Naomi Kawamura ; Hitoshi Ohsawa ; Izaskun Gil de Muro ; Kiyonori Suzuki ; Fernando Plazaola ; Teofilo Rojo
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：February 2008
• 年：2008
• 卷：8
• 期：2
• 页码：661 - 667
• 全文大小：412K
• 年卷期：v.8,no.2(February 2008)
• ISSN：1530-6992

文摘

We report a direct observation of the intrinsic magnetization behavior of Au in thiol-capped gold nanoparticles with permanent magnetismat room temperature. Two element specific techniques have been used for this purpose: X-ray magnetic circular dichroism on the Ledges of the Au and ¹⁹⁷Au Mössbauer spectroscopy. Besides, we show that silver and copper nanoparticles synthesized by the samechemical procedure also present room-temperature permanent magnetism. The observed permanent magnetism at room temperature in Agand Cu dodecanethiol-capped nanoparticles proves that the physical mechanisms associated to this magnetization process can be extendedto more elements, opening the way to new and still not-discovered applications and to new possibilities to research basic questions ofmagnetism.