Plasma and Fusion Research

Volume 18, 2101078 (2023)

Review Articles

Metastable Oxides with Magnetic Functionalities
Katsuhisa TANAKA
Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
(Received 29 January 2023 / Accepted 7 July 2023 / Published 28 August 2023)

Abstract

Inorganic solid-state materials comprise several types of polymorphs with different structures and properties. Among these, only one of the polymorphs is stable, whereas the others are metastable at ambient temperature and pressure. Sometimes, metastable phases exhibit more curious structures and properties and excellent functionalities than those of the stable phase. Such a phenomenon has been observed in magnetic properties of oxides as well. This paper presents some metastable oxides that manifest magnetic properties and functionalities never observed in their stable counterparts; ferrimagnetism of spinel-type ZnFe2O4 with high magnetization and a high magnetic-phase transition temperature; ferromagnetism observed in metastable Eu2+-based perovskite-type oxides, such as EuTiO3, EuZrO3, and EuHfO3; and ferromagnetism of the amorphous oxides containing a large amount of Eu2+ ions. Amorphous oxides clearly exhibiting ferromagnetic transition are very rare.

Keywords

oxide, metastable phase, magnetic properties, ferromagnetism, ferrimagnetism, zinc ferrite, perovskite, divalent europium, amorphous phase

DOI: 10.1585/pfr.18.2101078

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