電流パルス列による磁界壁運動の共鳴増幅

Luc Thomas¹, Masamitsu Hayashi, Xin Jiang

¹IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. lucthom@us.ibm.com

Science (New York, N.Y.)

|March 17, 2007

まとめ

研究者は,共振電流パルスを使用して磁界壁の動きを拡大しました. この技術は,スピントロニックデバイスのドメイン壁操作に必要な電流を大幅に削減します.

科学分野:

物理物理学物理学とは
マテリアルサイエンス材料科学
電気工学電気工学とは

背景:

ナノ構造の磁域壁は,論理ゲートやメモリ要素として機能する磁電電子機器にとって極めて重要です.
これらのドメイン壁の電流による動きは,デバイスの動作に不可欠です.
ピニングポテンシャルに限られたドメイン壁は,スピン極化電流が値を下回ったときにプレセッショナル運動を示します.

研究の目的:

磁気領域壁の効率的な電流誘発運動のための方法を調査する.
ドメイン壁の振動の共鳴増幅を実証するために.
ナノ構造におけるドメイン壁操作に必要な電流を減らすために.

主な方法:

ナノ構造の中に磁域の壁を閉じ込め,ポテンシャルを固定する.
スピン極化電流を注入して, precessional motion を誘導する.
ドメイン壁の precession 周波数に調節された電流パルスの短い列車を適用して共鳴増幅を行う.

主要な成果:

精密に調節された電流パルスを用いて,磁界壁の振動の共鳴増幅を実証した.
電流密度が著しく低下したドメイン壁の動きを達成した.
非共振方法と比較して,電流の要求が5倍以上減少しました.

結論:

共振増幅は,磁界壁の動きを制御するための非常に効率的な経路を提供します.
この方法により,スピントロニックデバイスの消費電力を削減できます.
この発見は,よりエネルギー効率の良い磁気電子機器の応用への道を開く.

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