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タイトル: | Giant Faraday Rotation through Ultrasmall Fe^0_n Clusters in Superparamagnetic FeO-SiO_2 Vitreous Films |
著者: | Nakatsuka, Yuko Pollok, Kilian Wieduwilt, Torsten Langenhorst, Falko Schmidt, Markus A. Fujita, Koji https://orcid.org/0000-0002-1700-0889 (unconfirmed) Murai, Shunsuke https://orcid.org/0000-0002-4597-973X (unconfirmed) Tanaka, Katsuhisa https://orcid.org/0000-0002-1409-2802 (unconfirmed) Wondraczek, Lothar |
著者名の別形: | 藤田, 晃司 村井, 俊介 田中, 勝久 |
キーワード: | amorphous oxides magnetooptics ultrasmall metallic particles |
発行日: | Apr-2017 |
出版者: | Wiley |
誌名: | Advanced Science |
巻: | 4 |
号: | 4 |
論文番号: | 1600299 |
抄録: | Magnetooptical (MO) glasses and, in particular, Faraday rotators are becoming key components in lasers and optical information processing, light switching, coding, filtering, and sensing. The common design of such Faraday rotator materials follows a simple path: high Faraday rotation is achieved by maximizing the concentration of paramagnetic ion species in a given matrix material. However, this approach has reached its limits in terms of MO performance; hence, glass-based materials can presently not be used efficiently in thin film MO applications. Here, a novel strategy which overcomes this limitation is demonstrated. Using vitreous films of xFeO·(100 − x)SiO_2, unusually large Faraday rotation has been obtained, beating the performance of any other glassy material by up to two orders of magnitude. It is shown that this is due to the incorporation of small, ferromagnetic clusters of atomic iron which are generated in line during laser deposition and rapid condensation of the thin film, generating superparamagnetism. The size of these clusters underbids the present record of metallic Fe incorporation and experimental verification in glass matrices |
著作権等: | © 2016 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/225277 |
DOI(出版社版): | 10.1002/advs.201600299 |
PubMed ID: | 28435773 |
出現コレクション: | 学術雑誌掲載論文等 |
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