We performed a detailed study of Ni/NiO core–shell nanoparticles (NP) obtained with a gas aggregation source. The NP oxide shells were produced by oxidizing the NP with different procedures: deposition in oxygen atmosphere, post-annealing in air, sequential deposition of (a) first NiO layer, (b) Ni NP and (c) third NiO Layer. X-ray photoelectron spectroscopy from Ni 2p core-level gave information about the chemical state of Ni in the core and in the oxide shell, while scanning electron microscopy was used for investigation of the NP morphology. High quality scanning transmission electron microscopy in high angle annular dark field mode data demonstrated core–shell structure also for NiO/Ni NP/NiO samples. Fieldcooled/ zero-field-cooled magnetization curves and field-cooled isothermal hysteresis cycles at T = 5 K were recorded by a SQUID magnetometer. In this way, the relation between magnetic properties and oxide shell structure was assessed, showing the role played by the control of the formation of oxide on the exchange bias and interparticle magnetic interaction.

Controlled growth of Ni/NiO core–shell nanoparticles: Structure, morphology and tuning of magnetic properties / D'Addato, Sergio; Spadaro, MARIA CHIARA; Luches, Paola; Grillo, V.; Frabboni, Stefano; Valeri, Sergio; Ferretti, A. M.; Capetti, E.; Ponti, A.. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - STAMPA. - 306:(2014), pp. 2-6. [10.1016/j.apsusc.2014.02.060]

Controlled growth of Ni/NiO core–shell nanoparticles: Structure, morphology and tuning of magnetic properties

D'ADDATO, Sergio;SPADARO, MARIA CHIARA;LUCHES, Paola;FRABBONI, Stefano;VALERI, Sergio;
2014

Abstract

We performed a detailed study of Ni/NiO core–shell nanoparticles (NP) obtained with a gas aggregation source. The NP oxide shells were produced by oxidizing the NP with different procedures: deposition in oxygen atmosphere, post-annealing in air, sequential deposition of (a) first NiO layer, (b) Ni NP and (c) third NiO Layer. X-ray photoelectron spectroscopy from Ni 2p core-level gave information about the chemical state of Ni in the core and in the oxide shell, while scanning electron microscopy was used for investigation of the NP morphology. High quality scanning transmission electron microscopy in high angle annular dark field mode data demonstrated core–shell structure also for NiO/Ni NP/NiO samples. Fieldcooled/ zero-field-cooled magnetization curves and field-cooled isothermal hysteresis cycles at T = 5 K were recorded by a SQUID magnetometer. In this way, the relation between magnetic properties and oxide shell structure was assessed, showing the role played by the control of the formation of oxide on the exchange bias and interparticle magnetic interaction.
306
2
6
Controlled growth of Ni/NiO core–shell nanoparticles: Structure, morphology and tuning of magnetic properties / D'Addato, Sergio; Spadaro, MARIA CHIARA; Luches, Paola; Grillo, V.; Frabboni, Stefano; Valeri, Sergio; Ferretti, A. M.; Capetti, E.; Ponti, A.. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - STAMPA. - 306:(2014), pp. 2-6. [10.1016/j.apsusc.2014.02.060]
D'Addato, Sergio; Spadaro, MARIA CHIARA; Luches, Paola; Grillo, V.; Frabboni, Stefano; Valeri, Sergio; Ferretti, A. M.; Capetti, E.; Ponti, A.
File in questo prodotto:
File Dimensione Formato  
NiNiONPmagnASSci.pdf

non disponibili

Tipologia: Versione dell'editore (versione pubblicata)
Dimensione 1.2 MB
Formato Adobe PDF
1.2 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1060508
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 24
  • ???jsp.display-item.citation.isi??? 24
social impact