2次元のFe3GeTe2でゲート調節可能な室温フェロマグネティズム
Yujun Deng1,2,3, Yijun Yu1,2,3, Yichen Song1,2,3
1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
Nature
|October 24, 2018
まとめ
研究者らは,2次元 (2D) の鉄3ゲルマニウムテルリド (Fe3GeTe2) モノレイヤを分離する新しい技術を開発した. この2次元素材は 電子ゲートを使って 室温に調節可能な 鉄磁気性を表しており 先進的なスピントロニック装置への道を切り開いています
科学分野:
- 凝縮物質物理学
- 材料科学
- ナノテクノロジー
背景:
- ナノ電子機器の進歩は,特にスピントロニクスの磁気薄膜の研究に大きく依存しています.
- ヴァン・デル・ワールズの結晶は原子の薄さや化学的安定性,ゲート・チューナビリティを備えており,新しい電子アプリケーションに好都合です.
- 以前の研究では,Cr2Ge2Te6やCrI3のような低温の絶縁材料の2次元 (2D) の鉄磁気順序が示されました.
研究 の 目的:
- 装置を製造し,磁気輸送の研究のための金属磁石Fe3GeTe2の単層を分離する.
- 2D Fe3GeTe2における移動性鉄磁性の持続性とその磁性特性を調査する.
- 2D Fe3GeTe2の鉄磁気移行温度 (Tc) に対するイオンゲーティングの影響を調査する.
主な方法:
- 特殊な装置製造技術の開発
- 層のFe3GeTe2から原子的に薄い単層を分離する.
- 磁気輸送特性とTcに対するイオンゲートの影響の測定
主要な成果:
- 移動性鉄磁性はFe3GeTe2に単層レベルまで存在し,平面外の磁気結晶不均一性を表していることが確認されています.
- 純粋なFe3GeTe2単層の鉄磁気移行温度 (Tc) は,散布値 (205 K) と比較して抑制されます.
- イオンゲーティングはTcを大幅に高め,2D Fe3GeTe2で室温フェロマグネティズムを達成し,Tcの総量を上回ります.
結論:
- 2D Fe3GeTe2ではイオンゲーティングによって室温フェロマグネチズムが達成可能である.
- この原子的に薄いヴァン・ダー・ワールズの物質のゲート調節可能なフェロマグネチズムは,電圧制御磁気電子学の道を開きます.
- この研究は,次世代のスピントロニックおよび電子機器のための 2D ヴァン・ダー・ワールズの磁石の可能性を強調しています.
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