Phase ordering dynamics due to multi-order coexistence

多阶共存导致的相序动力学

• 批准号: 22KJ0870
• 负责人: 川原 光滋
• 金额: $ 1.09万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22KJ0870/
• 关键词: マルチフェロイクス; ドメインダイナミクス; 自由エネルギー

本研究は、複数の秩序が存在する系における、秩序間の相関による非自明な秩序化ダイナミクスの統一的理解を理論的に得ることを目的とした。そのために、マルチフェロイクス系の物質中に存在するドメイン壁の空間構造やその分裂に伴う欠陥構造の静的および動的な性質を理論計算および数値計算により解明することを目指し、現在までにその静的空間構造の解明に至った。この成果は動的性質解明のための下地になるとともに、マルチフェロイクス系において秩序間の相関に由来する非自明な空間構造が存在することを示したものである。本研究の重要な応用先として、マルチフェロイクス系のドメイン壁を用いた低エネルギー消費なメモリデバイス開発が挙げられるが、ドメイン壁の移動はメモリの読み書き過程に対応する基本的物性であり、その構造や分裂ダイナミクスはデバイスの性能に関わる重要な物性である。具体的には、典型的マルチフェロイクス物質GdFeO3の自由エネルギーモデルを構成し、空間2次元におけるドメイン壁の分裂構造を再急降下法による自由エネルギー最適化によって明らかにした。さらに秩序間の相関の強さによる欠陥構造の変化を系統的に議論した。その結果、トポロジカルな観点からは消滅すると考えられるドメイン壁の分裂構造が、エネルギーの準安定構造として物質中に存在しうること、またその際のドメイン壁同士の接触角が非等方的であり、古典的な力のつり合いの方程式で書けることを示した。特に、接触角の非等方性は複数種のドメイン壁が存在するという、マルチフェロイクス系の特殊性を反映したものである。これらの成果は投稿論文として取りまとめる予定である。

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