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

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Controlled co-deposition of FePt nanoparticles embedded in MgO: a detailed investigation of structure and electronic and magnetic properties (Articolo in rivista) (literal)

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S. D'Addato, V. Grillo, A. di Bona, P. Luches, S. Frabboni, S. Valeri, P. Lupo, F. Casoli, F. Albertini (2013)
Controlled co-deposition of FePt nanoparticles embedded in MgO: a detailed investigation of structure and electronic and magnetic properties
in Nanotechnology (Bristol, Online); IOP PUBLISHING LTD, BRISTOL BS1 6BE (Regno Unito)
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S. D'Addato, V. Grillo, A. di Bona, P. Luches, S. Frabboni, S. Valeri, P. Lupo, F. Casoli, F. Albertini (literal)

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Centro S3, Istituto Nanoscienze-CNR, via G Campi 213/a, I-41125 Modena, Italy Dipartimento FIM, Università di Modena e Reggio Emilia, via G Campi 213/a, I-41125 Modena, Italy CNR-IMEM, Parco delle Scienze 37a, I-43124 Parma, Italy (literal)

Titolo

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

Abstract

Films of FePt nanoparticles (NPs) embedded in MgO were obtained by controlled co-deposition of FePt NPs pre-formed by a gas aggregation source and of Mg evaporated in an oxygen atmosphere. Assemblies of core-shell FePt@MgO NPs and films of FePt NPs embedded in MgO matrix could be obtained by varying FePt and Mg deposition rates. Transmission electron microscopy (TEM) and high resolution-TEM revealed the core-shell structure of the NPs, with an FePt core (of average diameter ?d? = 4.75 nm) presenting a multitwinned icosahedral structure, and MgO partially in crystalline form. The functional effect of the MgO shell in shielding the FePt core from external oxidation was shown with XPS. Upon controlled annealing, a 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 temperature show a 'wasp-waist' shape, with small values of coercive field (Hc = 300-1400 Oe), decreasing at increasing amounts of co-deposited MgO. (literal)

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