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

doi:10.1103/PhysRevLett.103.115703

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

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-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 language	English
Article number	115703
Journal	Physical Review Letters
Volume	103
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.103.115703
Publication status	Published - 2009 Sep 11

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Kovács, András

AU - Sato, Kazuhisa

AU - Lazarov, Vlado K.

AU - Galindo, Pedro L.

AU - Konno, Toyohiko J.

AU - Hirotsu, Yoshihiko

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AB - 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.

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