Amorphous silicon dioxide (hereafter SiO2) samples were implanted with 380 keV Fe ions at room temperature. After the implantation, some samples were irradiated with 16 MeV Au ions. The magnetic property was investigated by using a SQUID magnetometer, and the morphology of Fe-implanted SiO2 samples was examined by using a transmission electron microscope and x-ray absorption spectroscopy (extended x-ray absorption fine structure and x-ray absorption near edge structure). The size of Fe nanoparticles increases with an increase in the amount of Fe implantation. A part of Fe nanoparticles consists of Fe oxides, and with an increase in the amount of Fe implantation, the valence state of Fe atoms and the structure of Fe nanoparticles gets close to those of metallic α-Fe. The room temperature magnetism was observed in Fe-implanted SiO2 samples. The magnetization–magnetic field curves for samples implanted with a small amount of Fe are reproduced by the Langevin equation, implying that Fe nanoparticles present the superparamagnetic behavior. For a large amount of Fe implantation, the magnetization–magnetic field curve shows the ferromagnetic state. Such a result of magnetic property is consistent with the results of the x-ray absorption. By the subsequent 16 MeV Au irradiation, the Fe nanoparticles were fragmentated, resulting in the decrease in magnetization. The optical absorption property of the SiO2 samples is briefly discussed.
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28 October 2022
Research Article|
October 24 2022
Structure and magnetic properties of Fe nanoparticles in amorphous silica implanted with Fe ions and effect of subsequent energetic heavy ion irradiation
Special Collection:
Radiation Effects in Materials
A. Iwase
;
A. Iwase
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Writing – original draft)
1Department of Quantum and Radiation Engineering,
Osaka
Metropolitan University (OMU)
, Sakai, Osaka 599-8531, Japan
2
The Wakasa Wan Energy Research Center (WERC)
, Tsuruga, Fukui 914-0192, Japan
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K. Fukuda;
K. Fukuda
(Data curation, Formal analysis, Investigation)
1Department of Quantum and Radiation Engineering,
Osaka
Metropolitan University (OMU)
, Sakai, Osaka 599-8531, Japan
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Y. Saitoh;
Y. Saitoh
(Investigation)
3
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology (QST-Takasaki)
, Takasaki, Gunma 370-1292, Japan
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Y. Okamoto;
Y. Okamoto
(Data curation, Investigation)
4
Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA)
, Sayo, Hyogo 679-5198, Japan
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S. Semboshi;
S. Semboshi
(Data curation, Investigation)
5
Institute for Materials Research (IMR), Tohoku University
, Sendai, Miyagi 980-8577, Japan
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H. Amekura
;
H. Amekura
(Funding acquisition, Writing – review & editing)
6
National Institute for Materials Science (NIMS)
, Sakura, Tsukuba, Ibaraki 305-0003, Japan
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T. Matsui
T. Matsui
(Conceptualization, Data curation, Funding acquisition, Investigation, Writing – review & editing)
1Department of Quantum and Radiation Engineering,
Osaka
Metropolitan University (OMU)
, Sakai, Osaka 599-8531, Japan
7
Faculty of Liberal Arts, Sciences and Global Education
, Osaka Metropolitan University (OMU), Sakai, Osaka 599-8531, Japan
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Note: This paper is part of the Special Topic on Radiation Effects in Materials.
J. Appl. Phys. 132, 163902 (2022)
Article history
Received:
June 09 2022
Accepted:
September 22 2022
Citation
A. Iwase, K. Fukuda, Y. Saitoh, Y. Okamoto, S. Semboshi, H. Amekura, T. Matsui; Structure and magnetic properties of Fe nanoparticles in amorphous silica implanted with Fe ions and effect of subsequent energetic heavy ion irradiation. J. Appl. Phys. 28 October 2022; 132 (16): 163902. https://doi.org/10.1063/5.0102438
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