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

金属材料研究所 (研究所レベル所属のみ)

研究成果: Article › 査読

27 被引用数 (Scopus)

抄録

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.

本文言語	English
論文番号	115703
ジャーナル	Physical review letters
巻	103
号	11
DOI	https://doi.org/10.1103/PhysRevLett.103.115703
出版ステータス	Published - 2009 9月 11

ASJC Scopus subject areas

物理学および天文学（全般）

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10.1103/PhysRevLett.103.115703

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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

PY - 2009/9/11

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N2 - 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.

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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Direct observation of a surface induced disordering process in magnetic nanoparticles

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