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タイトル: Nanometer-size hard magnetic ferrite exhibiting high optical-transparency and nonlinear optical-magnetoelectric effect
著者: Ohkoshi, Shin-ichi
Namai, Asuka
Imoto, Kenta
Yoshikiyo, Marie
Tarora, Waka
Nakagawa, Kosuke
Komine, Masaya
Miyamoto, Yasuto
Nasu, Tomomichi
Oka, Syunsuke
Tokoro, Hiroko
発行日: 2015年10月6日
出版者: Nature Publishing Group
掲載誌情報: Shin-ichi Ohkoshi, Asuka Namai, Kenta Imoto, Marie Yoshikiyo, Waka Tarora, Kosuke Nakagawa, Masaya Komine, Yasuto Miyamoto, Tomomichi Nasu, Syunsuke Oka, and Hiroko Tokoro, "Nanometer-size hard magnetic ferrite exhibiting high optical-transparency and nonlinear optical-magnetoelectric effect", Scientific Reports 5, 14414 (2015), doi:10.1038/srep14414.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/the-worlds-smallest-hard-ferrite-magnet.html
抄録: Development of nanometer-sized magnetic particles exhibiting a large coercive field (Hc) is in high demand for densification of magnetic recording. Herein, we report a single-nanosize (i.e., less than ten nanometers across) hard magnetic ferrite. This magnetic ferrite is composed of ε-Fe2O3, with a sufficiently high Hc value for magnetic recording systems and a remarkably high magnetic anisotropy constant of 7.7 × 106 erg cm−3. For example, 8.2-nm nanoparticles have an Hc value of 5.2 kOe at room temperature. A colloidal solution of these nanoparticles possesses a light orange color due to a wide band gap of 2.9 eV (430 nm), indicating a possibility of transparent magnetic pigments. Additionally, we have observed magnetization-induced second harmonic generation (MSHG). The nonlinear optical-magnetoelectric effect of the present polar magnetic nanocrystal was quite strong. These findings have been demonstrated in a simple iron oxide, which is highly significant from the viewpoints of economic cost and mass production.
内容記述: UTokyo Research掲載「世界最小ハードフェライト磁石の開発に成功」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/the-worlds-smallest-hard-ferrite-magnet.html
UTokyo Research "The world's smallest hard ferrite magnet" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/the-worlds-smallest-hard-ferrite-magnet.html
URI: http://hdl.handle.net/2261/59068
ISSN: 2045-2322 (online)
出現カテゴリ:014 自然科学
1150910 学術雑誌論文


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