Magnetic properties of colloidal cobalt nanoclusters

Vincenzo Turco Liveri, Angela Monia Ruggirello, Capellini, Neisius, García Prieto, Fdez-Gubieda, Mobilio, Alessandro Longo, Meneghini, Alonso, Torchio

Risultato della ricerca: Article

3 Citazioni (Scopus)

Abstract

Abstract. Co nanoclusters were synthesized by an inverse-micelle chemical route. The magnetic and microstructural properties of the nanoparticles have been analyzed as a function of the surfactant (AOT and DEHP) and the drying method. Microstructural analysis has been performed by TEM and XANES; magnetic properties have been studied by hysteresis loops and zero-field cooling - field cooling (ZFC-FC) curves. TEM images show 2 to 4 nm sized particles spherical in shape. XANES measurements point out a significant presence of Co3O4 with metallic Co and some Co2+ bound to the surfactant. The presence of antiferromagnetic Co3O4 explains the magnetic transition observed at low T in both ZFC-FC measurements and hysteresis loops. Finally, the presence of magnetic interactions explains the bigger effective cluster size obtained from hysteresis loops fits (6-10 nm) compared to the sizes observed by TEM (2-4 nm).
Lingua originaleEnglish
pagine (da-a)072100-072103
Numero di pagine4
RivistaJOURNAL OF PHYSICS. CONFERENCE SERIES
Volume200
Stato di pubblicazionePublished - 2010

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nanoclusters
cobalt
magnetic properties
cooling
diethyl hydrogen phosphite (DEHP)
hysteresis
surfactants
transmission electron microscopy
drying
micelles
routes
nanoparticles
curves
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cita questo

Turco Liveri, V., Ruggirello, A. M., Capellini, Neisius, García Prieto, Fdez-Gubieda, ... Torchio (2010). Magnetic properties of colloidal cobalt nanoclusters. JOURNAL OF PHYSICS. CONFERENCE SERIES, 200, 072100-072103.

Magnetic properties of colloidal cobalt nanoclusters. / Turco Liveri, Vincenzo; Ruggirello, Angela Monia; Capellini; Neisius; García Prieto; Fdez-Gubieda; Mobilio; Longo, Alessandro; Meneghini; Alonso; Torchio.

In: JOURNAL OF PHYSICS. CONFERENCE SERIES, Vol. 200, 2010, pag. 072100-072103.

Risultato della ricerca: Article

Turco Liveri, V, Ruggirello, AM, Capellini, Neisius, García Prieto, Fdez-Gubieda, Mobilio, Longo, A, Meneghini, Alonso & Torchio 2010, 'Magnetic properties of colloidal cobalt nanoclusters', JOURNAL OF PHYSICS. CONFERENCE SERIES, vol. 200, pagg. 072100-072103.
Turco Liveri V, Ruggirello AM, Capellini, Neisius, García Prieto, Fdez-Gubieda e altri. Magnetic properties of colloidal cobalt nanoclusters. JOURNAL OF PHYSICS. CONFERENCE SERIES. 2010;200:072100-072103.
Turco Liveri, Vincenzo ; Ruggirello, Angela Monia ; Capellini ; Neisius ; García Prieto ; Fdez-Gubieda ; Mobilio ; Longo, Alessandro ; Meneghini ; Alonso ; Torchio. / Magnetic properties of colloidal cobalt nanoclusters. In: JOURNAL OF PHYSICS. CONFERENCE SERIES. 2010 ; Vol. 200. pagg. 072100-072103.
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T1 - Magnetic properties of colloidal cobalt nanoclusters

AU - Turco Liveri, Vincenzo

AU - Ruggirello, Angela Monia

AU - Capellini, null

AU - Neisius, null

AU - García Prieto, null

AU - Fdez-Gubieda, null

AU - Mobilio, null

AU - Longo, Alessandro

AU - Meneghini, null

AU - Alonso, null

AU - Torchio, null

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N2 - Abstract. Co nanoclusters were synthesized by an inverse-micelle chemical route. The magnetic and microstructural properties of the nanoparticles have been analyzed as a function of the surfactant (AOT and DEHP) and the drying method. Microstructural analysis has been performed by TEM and XANES; magnetic properties have been studied by hysteresis loops and zero-field cooling - field cooling (ZFC-FC) curves. TEM images show 2 to 4 nm sized particles spherical in shape. XANES measurements point out a significant presence of Co3O4 with metallic Co and some Co2+ bound to the surfactant. The presence of antiferromagnetic Co3O4 explains the magnetic transition observed at low T in both ZFC-FC measurements and hysteresis loops. Finally, the presence of magnetic interactions explains the bigger effective cluster size obtained from hysteresis loops fits (6-10 nm) compared to the sizes observed by TEM (2-4 nm).

AB - Abstract. Co nanoclusters were synthesized by an inverse-micelle chemical route. The magnetic and microstructural properties of the nanoparticles have been analyzed as a function of the surfactant (AOT and DEHP) and the drying method. Microstructural analysis has been performed by TEM and XANES; magnetic properties have been studied by hysteresis loops and zero-field cooling - field cooling (ZFC-FC) curves. TEM images show 2 to 4 nm sized particles spherical in shape. XANES measurements point out a significant presence of Co3O4 with metallic Co and some Co2+ bound to the surfactant. The presence of antiferromagnetic Co3O4 explains the magnetic transition observed at low T in both ZFC-FC measurements and hysteresis loops. Finally, the presence of magnetic interactions explains the bigger effective cluster size obtained from hysteresis loops fits (6-10 nm) compared to the sizes observed by TEM (2-4 nm).

KW - cobalt nanoparticles

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M3 - Article

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