Microstructure and Magnetism of Heavily Helium-Ion Irradiated Epitaxial Iron Films

This study reports on the microstructure and magnetism of pure iron irradiated with high doses of helium ions. Iron alloys are important structural materials used as components in fusion reactors, and a comprehensive database of their various properties has been developed. But little has been invest...

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Bibliographic Details
Published in:Metals (Basel ) 2023-11, Vol.13 (11), p.1905
Main Authors: Kamada, Yasuhiro, Umeyama, Daiki, Oyake, Tomoki, Murakami, Takeshi, Shimizu, Kazuyuki, Fujisaki, Satomi, Yoshimoto, Noriyuki, Ohsawa, Kazuhito, Watanabe, Hideo
Format: Article
Language:English
Subjects:
Alloys
Building materials
Chromium alloys
Chromium steel
Crystal structure
Electromagnetism
epitaxial film
Epitaxy
Ferrous alloys
first-principles calculation
Fusion reactors
Grain boundaries
Helium
helium cavity
Helium ions
High vacuum
Investigations
ion irradiation
Iron
Iron alloys
Irradiation
Magnetic properties
Magnetic saturation
Magnetism
Magnetization
Magnetization curves
Microstructure
Neutrons
Reactors
Room temperature
saturation magnetization
Single crystals
Thickness
Thin films
Transmission electron microscopes
Vacuum evaporation
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Summary:This study reports on the microstructure and magnetism of pure iron irradiated with high doses of helium ions. Iron alloys are important structural materials used as components in fusion reactors, and a comprehensive database of their various properties has been developed. But little has been investigated on magnetic properties, in particular, the effects of high doses and helium cavities are lacking. Single-crystal iron films, with a thickness of 200 nm, were prepared using the ultra-high vacuum evaporation method. These films were then irradiated with 30 keV He+ ions at room temperature up to a dose of 18 dpa. X-ray diffraction measurements and cross-sectional transmission electron microscope observations revealed significant microstructural changes, including a large lattice expansion perpendicular to the film plane and the formation of high-density cavities after irradiation. However, the saturation magnetization and the shape of the magnetization curve showed almost no change, indicating the robustness of the magnetic properties of iron.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13111905