結晶の反鉄磁性鉄酸化物で調節可能な長距離スピン輸送
R Lebrun1, A Ross2,3, S A Bender4
1Institute for Physics, Johannes Gutenberg-University Mainz, Mainz, Germany. rolebrun@uni-mainz.de.
Nature
|September 14, 2018
まとめ
研究者らは,抗鉄磁石断熱剤のヘマタイトで長距離スピン電流の輸送を実証した. この突破はスピンホール効果を活用し 外部磁場なしで動作する 効率的で低電力なスピントロニック装置への道を切り開きます
科学分野:
- 物理学
- 材料科学
- 電気工学
背景:
- Spintronicsは,従来型の電子機器を,低エネルギー消費のためのスピンベースの技術に置き換えることを目指しています.
- 反鉄磁性材料は,安定性や高周波動作によりスピントロニクスに利点がありますが,スピン輸送距離は限られています.
- 以前の研究では,反鉄磁石によるスピン伝達が数ナノメートルに制限されていることが示されました.
研究 の 目的:
- 遠距離スピン電流の伝播を反鉄磁気分離器で実証する.
- ヘマタイト (α-Fe2O3) のスピントロニクス応用の可能性を調査する.
- 反鉄磁石におけるスピン電流の制御方法を開発する.
主な方法:
- ヘマタイトの単一結晶にスピン注入するためにスピンホール効果を利用した.
- 外部磁場で反鉄磁気共鳴周波数を調節することによって,制御されたスピン電流.
- ヘマタイトとプラチナのインターフェースを介してスピン輸送を調査した.
主要な成果:
- ヘマタイトを介してスピン電流の長距離伝播を達成した.
- 複雑なフェロマグネットに匹敵する 効率的なスピン輸送を証明した.
- 反鉄磁気ネール順に並行してスピン情報伝達を示した.
結論:
- ヘマタイトのような反鉄磁石は 効率的な長距離スピン輸送をサポートします
- この研究は,電気的に調節可能な,超高速な,低電力反鉄磁石分離器ベースのスピントロニックデバイスの開発を可能にします.
- この発見は,室温で動作する磁場のないスピントロニック装置の可能性を示唆しています.
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