シングル・スピン・マグネトメーターによる非コリネア反鉄磁気系のリアル空間画像
I Gross1,2, W Akhtar1, V Garcia3
1Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France.
Nature
|September 15, 2017
まとめ
研究者は,新しいダイヤモンドベースの磁気計を使用して,室温でビスムートフェライト薄膜のナノスケールの反鉄磁気順序を視覚化しました. この技術は,将来のスピントロニックデバイスのスピンテクスチャの電気フィールド制御を可能にします.
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:
- 磁気モメントを切り替えるための高いエネルギーコストのために,鉄磁気材料は低電力スピントロニックアプリケーションで制限に直面しています.
- 非コリネア反鉄磁気システムは,効率的なスピン-電荷相互変換のための電場制御と新興スピン軌道効果を含む潜在的な利点を提供します.
- ナノスケールのイメージングと反鉄磁気システムの制御は 次世代スピントロニクスの進歩に不可欠です
研究 の 目的:
- ナノスケールで非コリネア反鉄磁石のリアル空間可視化を実証する.
- 複雑な反鉄磁性構造を画像化するための窒素空隙 (NV) 磁気測定の可能性を調査する.
- マルチフェロ材料のスピンテクスチャの電場制御を研究する.
主な方法:
- ダイヤモンドの窒素空隙 (NV) 欠陥に基づく非侵襲的なスキャンシングルスピン磁気計を使用した.
- マルチフェロイックビスムートフェライト (BiFeO3) の薄膜でスピンサイクロイドの室温画像を撮影した.
- BiFeO3の磁気結合を用いて,電場によってサイクロイドの伝播方向を操作する.
主要な成果:
- BiFeO3薄膜でナノスケール非コリニアアンチフェロマグネティック・オーダー (スピンサイクロイド) を視覚化しました.
- スピンサイクロイド周期は約70ナノメートルで,マクロスコープの difraktion 測定と一致する.
- サイクロイドの伝播方向に対する電場制御が実証され,磁電結合効果が示された.
結論:
- 窒素空白 (NV) マグネトメトリは,ナノスケールでの複雑な反鉄磁性命令のイメージングのための強力なツールです.
- ビスマスフェライト (BiFeO3) の薄膜は,磁気電気特性により,制御可能なナノスケールスピン構造を示します.
- これらの発見は,高度なスピントロニックデバイスのための再構成可能なナノスケールスピンテクスチャの設計に道を開きます.
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