Realization of multiferroics by mesopore-induced lattice distortion and spin-phonon coupling

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K05279
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Suzuki Norihiro 東京理科大学, 研究推進機構総合研究院, 講師 (10595888)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 無機工業化学 / セラミックス / ナノ材料 / 多孔体 / マルチフェロイック

Outline of Final Research Achievements

Aiming to realizing the multiferroics (i.e., simultaneous occurrence of ferroelectricity and ferromagnetism) by the porosity-derived crystal lattice distortion, a mesoporous EuTiO3 thin film was fabricated by the surfactant-assisted sol-gel method. Mosaic-like lattice distortion was introduced in the crystallized framework, while surface of the framework was amorphalized, which formed the core-shell structure. Unlike antiferromagnetic bulk, synthesized porous thin film showed ferromagnetic behavior. Amorphous surface layer as well as the lattice distortion of EuTiO3 crystal may cause the ferromagnetism.

Free Research Field

無機化学・物理化学（主として物性）

Academic Significance and Societal Importance of the Research Achievements

多孔体化およびアモルファス化により、バルクとは異なる物性をもたらすという新しいコンセプトを提案することができた。特にアモルファス化が材料物性に対し、ポジティブに働くという希有な例にたどり着くことができた点が、学術的に意義深い。