Direct observation of a surface induced disordering process in magnetic nanoparticles.

Kovács, András; Sato, Kazuhisa; Lazarov, Vlado K; Galindo, Pedro L; Konno, Toyohiko J; Hirotsu, Yoshihiko

Kovács, András; Sato, Kazuhisa; Lazarov, Vlado K; Galindo, Pedro L; Konno, Toyohiko J; Hirotsu, Yoshihiko.

Afiliación

Kovács A; Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom. andras.kovacs@materials.ox.ac.uk

Phys Rev Lett ; 103(11): 115703, 2009 Sep 11.

Article en En | MEDLINE | ID: mdl-19792385

RESUMEN

We present experimental evidence of surface induced disordering at magnetic FeCoPd nanoparticles during the L1(0)-A1 phase transition using high-resolution aberration-corrected electron microscopy and strain mapping. In situ electron diffraction studies show a narrow temperature range of fully ordered L1(0) structure. The order-disorder transition is size dependent and induces strong lattice deformation in outer part of the nanocrystals. The formation of unusually large strain of 20% is discussed in terms of core-shell structure formation with surface disordered layer and ordered core.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2009 Tipo del documento: Article País de afiliación: Reino Unido Pais de publicación: Estados Unidos

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