Elucidation of the mechanism of phase control and exploration of magnetic response functions in polymorphic magnets

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03441
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Aruga Katori Hiroko 東京農工大学, 工学(系)研究科(研究院), 教授 (10211707)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 多形 / 磁性

Outline of Final Research Achievements

In this study, magnetic materials that have the same chemical composition but multiple phases with different crystal structures are called polymorphic magnetic materials. In addition, the definition of polymorphism is extended to include phase changes induced by chemical pressure. By elucidating the mechanism of the phase change occurring in these extended polymorphic magnetic materials, we aimed to create new polymorphic magnetic materials as functional materials.
The magnetic material A2BO5 (A=Al,V,Cr,Fe,Ga, B=Si,Ge), which have the same chemical composition as the polymorphic mineral Al2SiO5, was systematically studied. In particular, in AlxFe2-xGeO5 (x=0.09, 0.15), neutron scattering experiments have revealed that the weak ferromagnetism in the andalusite structure is due to the incommensurate magnetic structure.

Free Research Field

磁気物性

Academic Significance and Societal Importance of the Research Achievements

多形の定義の拡張と相制御の機構の解明は、これまで見過ごしていた物質を多形磁性体として創製することを可能にするものである。また、現在発見されている多形における応答機能は、実用化にはかけ離れた環境下で生じることから、新規多形磁性体の基礎物性を評価することにより、実用化に適した磁気応答機能を持つ新たな多形物質の探索に繋げる。