講演抄録/キーワード |
講演名 |
2021-10-08 13:50
Gdx-Fe1-x磁性細線を用いた磁気光学光変調素子の電流誘起磁壁移動特性 ○早乙女巧真(東海大)・青島賢一(NHK)・保坂千都(東京電機大)・船橋信彦・東田 諒(NHK)・秋山泰伸(東海大)・町田賢司(NHK) |
抄録 |
(和) |
電流誘起磁壁移動を用いた磁気光学光変調素子(MO素子)はナノマグネット(NM)とGd-Fe磁性細線で構成される。NMによりGd-Fe磁性細線上に初期磁区が生成する。電流により初期磁区を拡大・縮小し磁化反転することで光変調を行う。今回、Gd-Feの組成(Gd24.5, Gd24.1%)を変えたMO素子を試作し、磁壁移動特性の違いを調べた。Gd24.5%のMO素子はGd24.1%の素子に比べて保磁力が大きく、動作電流が1.1mA~1.3mAとGd24.1%の素子(1.0mA)に比べて高いが、磁壁移動距離は大きく、光変調を行う領域が1.20 μmとGd24.1%の素子(0.33μm)に比べてはるかに大きかった。Gd24.5%の素子ではより大きな面積で光変調ができるため、大幅な光利用効率の向上がはかれることが分かった。 |
(英) |
A magneto-optical light modulation element (MO element) using current-induced domain wall movement is composed of a nanomagnet (NM) and a Gd-Fe magnetic wire. An initial magnetic domain is generated on the Gd-Fe magnetic wire by NM. Optical modulation is performed by enlarging / reducing the initial magnetic domain with an electric current and reversing the magnetization. This time, we made a prototype MO element with different Gd-Fe composition (Gd24.5, Gd24.1%) and investigated the difference in domain wall movement characteristics. The MO element with Gd24.5% has a larger coercive force than the element with Gd24.1%, and the operating current is 1.1mA to 1.3mA, which is higher than the element with Gd24.1% (1.0mA), but the domain wall movement distance. Was large, and the region for optical modulation was 1.20μm, which was much larger than that of the device with Gd 24.1% (0.33μm). It was found that the Gd24.5% element can perform optical modulation in a larger area, which can greatly improve the optical utilization efficiency. |
キーワード |
(和) |
電子ホログラフィ / 電流誘起磁壁移動 / 磁気光学Kerr効果 / / / / / |
(英) |
Electron holography / current-driven domain wall movement / magneto-optical Kerr effect / / / / / |
文献情報 |
映情学技報, vol. 45, no. 28, MMS2021-33, pp. 13-18, 2021年10月. |
資料番号 |
MMS2021-33 |
発行日 |
2021-10-01 (MMS) |
ISSN |
Print edition: ISSN 1342-6893 Online edition: ISSN 2424-1970 |
PDFダウンロード |
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