Structure and magnetic properties of Fe–Pd silica composites prepared by sequential ion implantation

Fernández, César de Julián; Mattei, Giovanni; Sangregorio, Claudio; Tagliente, M.A.; Bello, Valentina; Battaglin, Giancarlo; Sada, Cinzia; Tapfer, L.; Gatteschi, Dante; Mazzoldi, P.

doi:10.1016/j.jnoncrysol.2004.08.158

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The technique results are particularly interesting for development of alloy NPs [55]. When different species are implanted subsequently, the implantation order can alter the structure of the NP completely [58]. For instance, when FeAl NP are formed by sequential ion implantation, it is found that if the Fe is implanted first, it yields to core-shell structures, while implanting Al before Fe gives rise to bcc Fe-Al alloy NPs [59,60].…”

Section: Ion Implantationmentioning

confidence: 99%

Metallic Magnetic Nanoparticles

Hernando

Crespo

García

2005

The Scientific World JOURNAL

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In this paper, we reviewed some relevant aspects of the magnetic properties of metallic nanoparticles with small size (below 4 nm), covering the size effects in nanoparticles of magnetic materials, as well as the appearance of magnetism at the nanoscale in materials that are nonferromagnetic in bulk. These results are distributed along the text that has been organized around three important items: fundamental magnetic properties, different fabrication procedures, and characterization techniques. A general introduction and some experimental results recently obtained in Pd and Au nanoparticles have also been included. Finally, the more promising applications of magnetic nanoparticles in biomedicine are indicated. Special care was taken to complete the literature available on the subject.

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Section: Ion Implantationmentioning

confidence: 99%

Metallic Magnetic Nanoparticles

Hernando

Crespo

García

2005

The Scientific World JOURNAL

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“…[1][2][3][4][5] Recently, attention has turned to the fabrication of embedded binary alloy nanostructures including core/shell [6][7][8][9] and lobe/lobe [10] nanostructures. Some synthesis routes (e. g., ion beam synthesis [6][7][8][9]) drive the system far from equilibrium, and often it is not clear if the experimentally observed structure is thermodynamically stable, or is the result of kinetics. However, knowledge of the stable structure is key to designing processing routes leading to desired nanostructures.…”

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confidence: 99%

Particle Image Velocimetry

Yuan¹,

Shin²,

Liao³

et al. 2008

Topics in Applied Physics

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The equilibrium structure of embedded nanocrystals formed from strongly segregating binaryalloys is considered within a simple thermodynamic model. The model identifies two dimensionless interface energies that dictate the structure, and allows prediction of the stable structure for any choice of these parameters. The resulting structure map includes three distinct nanocrystal morphologies: core/shell, lobe/lobe, and completely separated spheres.

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“…1 The majority of investigated material systems show alloyed NC formation ͑for example, Au-Ag, Au-Cu, Cu-Ni, and Ni-Co͒. 2 Core-shell NCs have been reported for the Ag-Cu system, 3 the Ag-S system ͑as Ag cores with Ag 2 S shells 4 ͒, the Fe-Al system, 5 and the Pd-Cu system ͑as Pd rich cores with CuO shells͒. 6 In the present letter, we demonstrate the formation of Co-Au core-shell NCs in thin SiO 2 fabricated by sequential ion implantation of Au and Co.…”

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confidence: 99%

Co–Au core-shell nanocrystals formed by sequential ion implantation into SiO2

Kluth

Hoy

Johannessen

et al. 2006

Applied Physics Letters

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Co-Au core-shell nanocrystals ͑NCs͒ were formed by sequential ion implantation of Au and Co into thin SiO 2. The NCs were investigated by means of transmission electron microscopy and extended x-ray absorption fine structure spectroscopy. The latter reveals a bond length expansion in the Co core compared to monatomic Co NCs. Concomitantly, a significant contraction of the bond length and a significant reduction of the effective Au-Au coordination number were observed in the Au shells. Increased Debye-Waller factors indicate significant strain in the NCs. These experimental results verify recent theoretical predictions.

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Structure and magnetic properties of Fe–Pd silica composites prepared by sequential ion implantation

Cited by 8 publications

References 12 publications

Metallic Magnetic Nanoparticles

Metallic Magnetic Nanoparticles

Particle Image Velocimetry

Co–Au core-shell nanocrystals formed by sequential ion implantation into SiO2

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