title: Chemically induced permanent magnetism in Au, Ag, and Cu nanoparticles: localization of the magnetism by element selective techniques.
abstract: We report a direct observation of the intrinsic magnetization behavior of Au in thiol-capped gold nanoparticles with permanent magnetism at room temperature. Two element specific techniques have been used for this purpose: X-ray magnetic circular dichroism on the L edges of the Au and 197Au Mössbauer spectroscopy. Besides, we show that silver and copper nanoparticles synthesized by the same chemical procedure also present room-temperature permanent magnetism. The observed permanent magnetism at room temperature in Ag and Cu dodecanethiol-capped nanoparticles proves that the physical mechanisms associated to this magnetization process can be extended to more elements, opening the way to new and still not-discovered applications and to new possibilities to research basic questions of magnetism.
authors.affiliation: Zientzia eta Teknologia Fakultatea. Euskal Herriko Unibertsitatea, 644pk. 48820 Bilbao, Spain. garita@we.lc.ehu.es
authors.forename: José S
authors.initials: JS
authors.lastname: Garitaonandia
authors.forename: Maite
authors.initials: M
authors.lastname: Insausti
authors.forename: Eider
authors.initials: E
authors.lastname: Goikolea
authors.forename: Motohiro
authors.initials: M
authors.lastname: Suzuki
authors.forename: John D
authors.initials: JD
authors.lastname: Cashion
authors.forename: Naomi
authors.initials: N
authors.lastname: Kawamura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ohsawa
authors.forename: Izaskun Gil
authors.initials: IG
authors.lastname: de Muro
authors.forename: Kiyonori
authors.initials: K
authors.lastname: Suzuki
authors.forename: Fernando
authors.initials: F
authors.lastname: Plazaola
authors.forename: Teofilo
authors.initials: T
authors.lastname: Rojo
mesh_terms: D003300:Copper / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008280:Magnetics; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D012834:Silver; D006046:Gold; D003300:Copper