Magnetic properties of FePt nanodots formed by a self-assembled nanodot deposition method

C. K. Yin; T. Fukushima; T. Tanaka; M. Koyanagi; J. C. Bea; H. Choi; M. Nishijima; M. Miyao

doi:10.1063/1.2335588

Magnetic properties of FePt nanodots formed by a self-assembled nanodot deposition method

C. K. Yin, T. Fukushima, T. Tanaka, M. Koyanagi, J. C. Bea, H. Choi, M. Nishijima, M. Miyao

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Fe₅₀Pt₅₀ nanodots dispersed in a SiO₂ film (Fe₅₀Pt₅₀ nanodot film) were formed by a self-assembled nanodot deposition (SAND) method in which Fe₅₀Pt₅₀ and SiO₂ are cosputtered in a high vacuum rf magnetron sputtering equipment. Fe₅₀Pt₅₀ pellets are laid on a SiO₂ target in a sputtering chamber to form the Fe₅₀Pt₅₀ nanodot film in the SAND method. The size and density of Fe₅₀Pt ₅₀ nanodot were controlled by changing the ratio of the total area of Fe₅₀Pt₅₀ pellets to that of SiO₂ target. The Fe₅₀Pt₅₀ nanodot size decreases and its density increases when the ratio decreases. As-deposited Fe₅₀Pt₅₀ nanodots self-assembled to a face-centered-cubic phase of single-crystal structure. The Fe₅₀Pt₅₀ nanodot films were annealed to evaluate the nanodot size controllability, the magnetic anisotropy, and the thermal stability. Fully ordered L1₀ face-centered-tetragonal Fe ₅₀Pt₅₀ nanodots with high magnetocrystalline anisotropy (K_u ≅ 8.7 × 10⁷ ergs/cm³) were obtained by in situ annealing at 600°C for 1 h in a high vacuum ambience. Furthermore, the Fe₅₀Pt₅₀ nanodot film with a monolayer of Fe₅₀Pt₅₀ nanodots was formed by annealing at 800°C due to the agglomeration of Fe₅₀Pt₅₀ nanodots in the SiO₂ film.

Original language	English
Article number	063109
Journal	Applied Physics Letters
Volume	89
Issue number	6
DOIs	https://doi.org/10.1063/1.2335588
Publication status	Published - 2006

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Physics and Astronomy (miscellaneous)

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@article{569885bba2c14b79b56a2558d6b9dadf,

title = "Magnetic properties of FePt nanodots formed by a self-assembled nanodot deposition method",

abstract = "Fe50Pt50 nanodots dispersed in a SiO2 film (Fe50Pt50 nanodot film) were formed by a self-assembled nanodot deposition (SAND) method in which Fe50Pt50 and SiO2 are cosputtered in a high vacuum rf magnetron sputtering equipment. Fe50Pt50 pellets are laid on a SiO2 target in a sputtering chamber to form the Fe50Pt50 nanodot film in the SAND method. The size and density of Fe50Pt 50 nanodot were controlled by changing the ratio of the total area of Fe50Pt50 pellets to that of SiO2 target. The Fe50Pt50 nanodot size decreases and its density increases when the ratio decreases. As-deposited Fe50Pt50 nanodots self-assembled to a face-centered-cubic phase of single-crystal structure. The Fe50Pt50 nanodot films were annealed to evaluate the nanodot size controllability, the magnetic anisotropy, and the thermal stability. Fully ordered L10 face-centered-tetragonal Fe 50Pt50 nanodots with high magnetocrystalline anisotropy (Ku ≅ 8.7 × 107 ergs/cm3) were obtained by in situ annealing at 600°C for 1 h in a high vacuum ambience. Furthermore, the Fe50Pt50 nanodot film with a monolayer of Fe50Pt50 nanodots was formed by annealing at 800°C due to the agglomeration of Fe50Pt50 nanodots in the SiO2 film.",

author = "Yin, {C. K.} and T. Fukushima and T. Tanaka and M. Koyanagi and Bea, {J. C.} and H. Choi and M. Nishijima and M. Miyao",

note = "Funding Information: This work was performed in Venture Business Laboratory, Tohoku University, and supported by the Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Agency (JST). The authors would like to thank S. Samukawa and S. Kono (both of Tohoku University) for their assistance and helpful discussions.",

year = "2006",

doi = "10.1063/1.2335588",

language = "English",

volume = "89",

journal = "Applied Physics Letters",

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T1 - Magnetic properties of FePt nanodots formed by a self-assembled nanodot deposition method

AU - Yin, C. K.

AU - Fukushima, T.

AU - Tanaka, T.

AU - Koyanagi, M.

AU - Bea, J. C.

AU - Choi, H.

AU - Nishijima, M.

AU - Miyao, M.

N1 - Funding Information: This work was performed in Venture Business Laboratory, Tohoku University, and supported by the Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Agency (JST). The authors would like to thank S. Samukawa and S. Kono (both of Tohoku University) for their assistance and helpful discussions.

PY - 2006

Y1 - 2006

N2 - Fe50Pt50 nanodots dispersed in a SiO2 film (Fe50Pt50 nanodot film) were formed by a self-assembled nanodot deposition (SAND) method in which Fe50Pt50 and SiO2 are cosputtered in a high vacuum rf magnetron sputtering equipment. Fe50Pt50 pellets are laid on a SiO2 target in a sputtering chamber to form the Fe50Pt50 nanodot film in the SAND method. The size and density of Fe50Pt 50 nanodot were controlled by changing the ratio of the total area of Fe50Pt50 pellets to that of SiO2 target. The Fe50Pt50 nanodot size decreases and its density increases when the ratio decreases. As-deposited Fe50Pt50 nanodots self-assembled to a face-centered-cubic phase of single-crystal structure. The Fe50Pt50 nanodot films were annealed to evaluate the nanodot size controllability, the magnetic anisotropy, and the thermal stability. Fully ordered L10 face-centered-tetragonal Fe 50Pt50 nanodots with high magnetocrystalline anisotropy (Ku ≅ 8.7 × 107 ergs/cm3) were obtained by in situ annealing at 600°C for 1 h in a high vacuum ambience. Furthermore, the Fe50Pt50 nanodot film with a monolayer of Fe50Pt50 nanodots was formed by annealing at 800°C due to the agglomeration of Fe50Pt50 nanodots in the SiO2 film.

AB - Fe50Pt50 nanodots dispersed in a SiO2 film (Fe50Pt50 nanodot film) were formed by a self-assembled nanodot deposition (SAND) method in which Fe50Pt50 and SiO2 are cosputtered in a high vacuum rf magnetron sputtering equipment. Fe50Pt50 pellets are laid on a SiO2 target in a sputtering chamber to form the Fe50Pt50 nanodot film in the SAND method. The size and density of Fe50Pt 50 nanodot were controlled by changing the ratio of the total area of Fe50Pt50 pellets to that of SiO2 target. The Fe50Pt50 nanodot size decreases and its density increases when the ratio decreases. As-deposited Fe50Pt50 nanodots self-assembled to a face-centered-cubic phase of single-crystal structure. The Fe50Pt50 nanodot films were annealed to evaluate the nanodot size controllability, the magnetic anisotropy, and the thermal stability. Fully ordered L10 face-centered-tetragonal Fe 50Pt50 nanodots with high magnetocrystalline anisotropy (Ku ≅ 8.7 × 107 ergs/cm3) were obtained by in situ annealing at 600°C for 1 h in a high vacuum ambience. Furthermore, the Fe50Pt50 nanodot film with a monolayer of Fe50Pt50 nanodots was formed by annealing at 800°C due to the agglomeration of Fe50Pt50 nanodots in the SiO2 film.

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JF - Applied Physics Letters

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ER -

Magnetic properties of FePt nanodots formed by a self-assembled nanodot deposition method

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