磁気トンネル交差点におけるスピン・トルク・ダイオード効果

A A Tulapurkar¹, Y Suzuki, A Fukushima

¹Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.

Nature

|November 18, 2005

まとめ

研究者らは,磁気トンネル交差点で新しいスピントロニック現象を発見した. ラジオ周波数電流を適用すると,特定の周波数で直流電圧が生み出され,電気通信用の潜在的ナノ検出器が可能になります.

科学分野:

スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.
凝縮物質物理学凝縮物質物理学
ナノテクノロジーナノテクノロジー

背景:

Spintronicデバイスは,従来の電子機器を超えた新しい機能のために電子スピンを活用します.
スピン極化電流は,磁気モメントにトルクを与え,回転を引き起こします.

研究の目的:

スピンダイナミクスとスピン依存輸送から生じる新しい現象を調査する.
電波周波数検出器として磁気トンネル交差点の可能性を調査する.

主な方法:

ラジオ周波数交流電流をナノメートルスケールの磁気トンネル交差点に適用する.
共振周波数における直流電圧生成の観測.
外部磁場とのチューニング共鳴.

主要な成果:

測定可能な直流電圧は,電波周波数電流の周波数がスピン振動共振と一致するときに生成されます.
磁気トンネル交差点は,共鳴時の電流の方向に基づいて,異なる抵抗状態を示します.
この振る舞いは,従来の半導体ダイオードとは大きく異なる.

結論:

観測された現象は,スピントルク効果とダイオード行動に基づいて,新しいスピントロニック機能を提供します.
この発見は,通信回路用のナノメートルスケールの無線周波数検出器の開発につながる可能性がある.

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