Fluctuation of long-range order in Co-Pt alloy nanoparticles revealed by time-resolved electron microscopy

Sato, Kazuhisa; Yasuda, Hidehiro

Applied Physics Letters, 2017, 110(15), 153101

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Identifier to cite or link to this item: https://hdl.handle.net/11094/89410

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Title
Fluctuation of long-range order in Co-Pt alloy nanoparticles revealed by time-resolved electron microscopy
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
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Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
NRID
1000060210259 1000060210259
CreatorName
Yasuda, Hidehiro
Description
Kazuhisa Sato and Hidehiro Yasuda, "Fluctuation of long-range order in Co-Pt alloy nanoparticles revealed by time-resolved electron microscopy", Appl. Phys. Lett. 110, 153101 (2017) https://doi.org/10.1063/1.4980077.
Abstract
The development of long-range order in disordered Co-Pt alloy nanoparticles has been atomically resolved in situ with an ultra-high voltage electron microscope equipped with a direct electron detection camera. Electron-irradiation-enhanced ordering occurred at 573 K with 1 MeV electrons at a dose rate of 8.9 × 10²⁴e/m²s. High-speed (400 frames/s) imaging revealed fluctuations of the c-axis orientation of the L1₀-type ordered structure. Specifically, the c-axis orientation changes occurred at 2.5-ms intervals. Thus, the atomic ordering rate at 573 K is deduced to be 3 × 10⁻¹⁷m²/s, which is 10¹³ times higher than that estimated for interdiffusion in a bulk Co-Pt alloy. The observed kinetic ordering temperature of 573 K is significantly lower than that reported previously (>800 K). The low-temperature ordering may be the result of enhanced atom migration via excess vacancies, 10⁶ times higher than that at thermal equilibrium, introduced by the high-energy electron irradiation.
Publisher
American Institute of Physics
Source Title
Applied Physics Letters
Volume (Issue)
110(15)
Page
153101
Date of Issued
2017-04-10
Language
English
Handle URL
https://hdl.handle.net/11094/89410
PISSN
00036951
NCID
AA00543431
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DOI (Publisher Version)
https://doi.org/10.1063/1.4980077
Access Rights
open access
CopyRight
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Kazuhisa Sato and Hidehiro Yasuda, "Fluctuation of long-range order in Co-Pt alloy nanoparticles revealed by time-resolved electron microscopy", Appl. Phys. Lett. 110, 153101 (2017) and may be found at https://doi.org/10.1063/1.4980077.
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学術雑誌論文 Journal Article