単一の磁域壁の電流誘発共振と質量決定
Eiji Saitoh1, Hideki Miyajima, Takehiro Yamaoka
1Department of Physics, Keio University, Yokohama, 223-8522, Japan. eizi@phys.keio.ac.jp
Nature
|November 13, 2004
まとめ
研究者は,粒子のように振る舞う磁域壁 (DWs) の質量を測定した. この発見は,電流を用いた高速で高密度の磁気記憶の開発に不可欠です.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
背景:
- マグネット領域壁 (DWs) は,磁石のトポロジカルな欠陥である.
- DWは,電流と相互作用する巨大な粒子として振る舞うと予測されています.
- DW質量の理解は,高密度磁気メモリアプリケーションの鍵です.
研究 の 目的:
- 磁場壁の質量を実験的に決定する.
- フェロ磁性ナノワイヤのDWのダイナミクスと操作を調査する.
主な方法:
- フェロ磁性ナノワイヤで単一のDWのためのチューニング可能なポテンシャルを準備しました.
- 振動する電流によって誘発されたDWの共振運動を検出しました.
主要な成果:
- 直接観測されたDWダイナミクスは,6.6 x 10^-23 kgの有限質量を示しています.
- 10^10 A m^-2 の電流密度で 10 マイクロメートルの DW 位移で低電流動作を達成しました.
結論:
- DW質量の実験的決定は,デバイスの速度に関する重要なデータを提供します.
- DWの低電流操作が実証され,実際の磁気メモリアプリケーションに不可欠です.
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