電子トンネリングによる2Dヴァン・ダー・ワールス結晶断熱器における磁性の探査
D R Klein1, D MacNeill1, J L Lado2,3
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|May 5, 2018
まとめ
研究者らは磁気絶縁体であるクロムトリヨイド (CrI3) を通してトンネルを掘削した. 磁場による重要な磁気移行を観測し,高磁気抵抗をもたらし,磁気刺激を明らかにした.
科学分野:
- 凝縮物質物理学
- 材料科学
- スピントロニクス
背景:
- 金属ハライドの層は,高度なデバイスのために様々な磁気状態を提供します.
- CrI3は有望な層の磁気分離器です
- このような材料の潜在能力を解き放つには,デバイス指向の特徴づけが不可欠です.
研究 の 目的:
- 温度と磁場の関数として CrI3 経由のトンネル輸送を調査する
- CrI3の磁気基底状態と層間結合を電気的に検出する.
- 不弾性トンネルスペクトロスコーピーを用いてCRI3内の磁気刺激を特徴づける.
主な方法:
- CrI3バリア (バイレイヤー,トライレイヤー,テトラレイヤー) を用いたトンネル接続の製造と電気的特徴付け
- 温度に依存し,磁場に依存する輸送測定.
- 不弾性電子トンネリングスペクトロスコーピー (IETS).
主要な成果:
- CrI3における磁性基底状態と層間結合の電気検知
- CrI3における磁場によるメタマグネティック移行の観測.
- 二層,三層,四層CrI3の磁気抵抗値はそれぞれ95%,300%および550%である.
- 集合的磁気刺激 (マグノン) を明らかにする非弾性トンネルスペクトル.
結論:
- CrI3は,電気輸送測定で利用可能な調節可能な磁気特性を示しています.
- 観測されたメタ磁気移行と高い磁気抵抗は,CRI3のスピントロニックアプリケーションの可能性を強調しています.
- 不弾性トンネリングスペクトロスコーピーは,CRI3の磁気刺激スペクトルについての洞察を提供します.
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