Films of FePt nanoparticles (NP) embedded in MgO were obtained by controlled co-deposition of FePt NP pre-formed by a gas aggregation source and of Mg evaporated in Oxygen atmosphere. Control over the deposition rate permitted to pass from FePt@MgO core-shell morphology to a film of MgO embedding FePt NP. Transmission Electron Microscopy (TEM) and High Resolution-TEM revealed the core-shell structure of the NP, with FePt core (of average diameter <d>= 4.75 nm) presenting a multi-twinned icosahedral structure, and MgO partially in crystalline form. The functional effect of MgO shell in shielding the FePt core from external oxidation was shown with XPS. Upon controlled annealing transition from A1 to L10 ordering could be obtained, with structural and morphological re-arrangement. The magnetic hysteresis loops obtained from Alternating Gradient Field Magnetometry at room temperatures show a “wasp-waist” shape, with small values of coercive field (Hc=300-1400 Oe), decreasing at increasing amount of co-deposited MgO.

Controlled co-deposition of FePt nanoparticles embedded in MgO: a detailed investigation of structure and electronic and magnetic properties / D'Addato, Sergio; V., Grillo; A., di Bona; P., Luches; Frabboni, Stefano; Valeri, Sergio; P., Lupo; F., Casoli; F., Albertini. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - STAMPA. - 24:49(2013), pp. 495703-1-495703-10. [10.1088/0957-4484/24/49/495703]

Controlled co-deposition of FePt nanoparticles embedded in MgO: a detailed investigation of structure and electronic and magnetic properties

D'ADDATO, Sergio;FRABBONI, Stefano;VALERI, Sergio;
2013

Abstract

Films of FePt nanoparticles (NP) embedded in MgO were obtained by controlled co-deposition of FePt NP pre-formed by a gas aggregation source and of Mg evaporated in Oxygen atmosphere. Control over the deposition rate permitted to pass from FePt@MgO core-shell morphology to a film of MgO embedding FePt NP. Transmission Electron Microscopy (TEM) and High Resolution-TEM revealed the core-shell structure of the NP, with FePt core (of average diameter = 4.75 nm) presenting a multi-twinned icosahedral structure, and MgO partially in crystalline form. The functional effect of MgO shell in shielding the FePt core from external oxidation was shown with XPS. Upon controlled annealing transition from A1 to L10 ordering could be obtained, with structural and morphological re-arrangement. The magnetic hysteresis loops obtained from Alternating Gradient Field Magnetometry at room temperatures show a “wasp-waist” shape, with small values of coercive field (Hc=300-1400 Oe), decreasing at increasing amount of co-deposited MgO.
2013
24
49
495703-1
495703-10
Controlled co-deposition of FePt nanoparticles embedded in MgO: a detailed investigation of structure and electronic and magnetic properties / D'Addato, Sergio; V., Grillo; A., di Bona; P., Luches; Frabboni, Stefano; Valeri, Sergio; P., Lupo; F., Casoli; F., Albertini. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - STAMPA. - 24:49(2013), pp. 495703-1-495703-10. [10.1088/0957-4484/24/49/495703]
D'Addato, Sergio; V., Grillo; A., di Bona; P., Luches; Frabboni, Stefano; Valeri, Sergio; P., Lupo; F., Casoli; F., Albertini
File in questo prodotto:
File Dimensione Formato  
FePtMgONPnanotechnoogy.pdf

Accesso riservato

Descrizione: Articolo
Tipologia: Versione pubblicata dall'editore
Dimensione 2.06 MB
Formato Adobe PDF
2.06 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
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: https://hdl.handle.net/11380/1007321
Citazioni
  • ???jsp.display-item.citation.pmc??? 3
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 13
social impact