Chemically induced permanent magnetism in Au, Ag, and Cu nanoparticles: localization of the magnetism by element selective techniques.
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.
Garitaonandia
José S
JS
Zientzia eta Teknologia Fakultatea. Euskal Herriko Unibertsitatea, 644pk. 48820 Bilbao, Spain. garita@we.lc.ehu.es
Insausti
Maite
M
Goikolea
Eider
E
Suzuki
Motohiro
M
Cashion
John D
JD
Kawamura
Naomi
N
Ohsawa
Hitoshi
H
de Muro
Izaskun Gil
IG
Suzuki
Kiyonori
K
Plazaola
Fernando
F
Rojo
Teofilo
T
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
D046911:Macromolecular Substances; D012834:Silver; D006046:Gold; D003300:Copper