Fabry-perot共振器の導入による透明強磁性Co-MgF2グラニュラー薄膜ファラデー効果の増強

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2018/12/01

タイトル(英語): Enhancement of Faraday-effect of Transparent Ferromagnetic Co-MgF2 Granular Film by Introducing Fabry-perot Resonant Structure

著者名: 宮本　光教（信州大学／シチズンファインデバイス（株）），久保　利哉（シチズンファインデバイス（株）），藤城　佑太（信州大学），塩田　健太（シチズンファインデバイス（株）），曽根原　誠（信州大学），佐藤　敏郎（信州大学）

著者名(英語): Mitsunori Miyamoto (Shinshu University/Citizen Finedevice Co., Ltd.), Toshiya Kubo (Citizen Finedevice Co., Ltd.), Yuta Fujishiro (Shinshu University), Kenta Shiota (Citizen Finedevice Co., Ltd.), Makoto Sonehara (Shinshu University), Toshiro Sato (Shinsh

キーワード: ファラデー効果，グラニュラー薄膜，強磁性，ファブリペロー共振，マルチキャビティ　　Faraday-effect，granular thin film，ferromagnetic，Fabry-perot resonance，multi cavity

要約(英語): To detect the magnetic field using polarization of a light, transparent magnetic material having a Faraday-effect is required. The Co-MgF2 granular film is promising as a candidate of the Faraday element for the magnetic field sensing. In this study, Fabry-perot resonant structure was introduced into the Co-MgF2 granular film to enhance the Faraday-effect. It was found that the Faraday-effect per unit film-thickness [deg./μm] was enhanced due to a light localized in the Co-MgF2 granular layer sandwiched by Bragg-mirror of the insulator multilayer. The maximum Faraday-effect of the proposed structure was -1.24 deg./μm, which was about 3.4 times enhancement compared with a single Co-MgF2 film, when the number of layer period x in Fabry-perot resonant multilayer was 5, where the structure was substrate/ (Ta2O5/SiO2)x/Co-MgF2/(SiO2/Ta2O5)2/Air. Furthermore, the multi cavity structure, consisting of the Fabry-perot resonant multilayer film continuously placed, exhibited a 50% increase of Figure of merit (FOM) defined as Faraday-rotation angle per transmission loss [deg./dB].

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.138 No.12 （2018） 特集：エネルギー変換システムの高効率・高機能化を支える磁気応用技術

本誌掲載ページ: 655-661 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/138/12/138_655/_article/-char/ja/