Direct observation of a surface induced disordering process in magnetic nanoparticles

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

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We present experimental evidence of surface induced disordering at magnetic FeCoPd nanoparticles during the L10-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 L10 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.

Original languageEnglish
Article number115703
JournalPhysical Review Letters
Volume103
Issue number11
DOIs
Publication statusPublished - 2009 Sep 11

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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