Ferroelectric and Magnetic Properties in Room-Temperature Multiferroic GaxFe2− xO3 Epitaxial Thin Films

Tsukasa Katayama, Shintaro Yasui, Yosuke Hamasaki, Takahisa Shiraishi, Akihiro Akama, Takenori Kiguchi, Mitsuru Itoh

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

GaFeO3-type iron oxide is a promising room-temperature multiferroic material due to its large magnetization. To expand its usability, controlling the ferroelectric and magnetic properties is crucial. In this study, high-quality GaxFe2– xO3 (x = 0–1) epitaxial films are fabricated and their properties are systematically investigated. All films exhibit room-temperature out-of-plane ferroelectricity, showing that the coercive electric field (Ec) decreases monotonically with x. Additionally, the films show in-plane ferrimagnetism with a Curie temperature (TC) >350 K at x = 0–0.6. The coercive magnetic field (Hc) decreases with x at x ≤ 0.6, but shows a constant value at x > 0.6, whereas the saturated magnetization (Ms) increases with x at x ≤ 0.6, but decreases with x at x > 0.6. X-ray magnetic circular dichroism reveals that the large magnetization at x = 0.6 is derived from Fe3+ (3d5) at octahedral sites. The controllable range of the Ec, Hc, and Ms values at room temperature (400–800 kV cm−1, 1–8 kOe, and 0.2–0.6 µB/f.u.) is very wide and differs from those of well-known multiferroic BiFeO3. Furthermore, the GaxFe2− xO3 films exhibit room-temperature magnetocapacitance effects, indicating that adjusting TC near room temperature is useful to achieve large room-temperature magnetocapacitance behavior.

Original languageEnglish
Article number1704789
JournalAdvanced Functional Materials
Volume28
Issue number2
DOIs
Publication statusPublished - 2018 Jan 10

Keywords

  • ferroelectricity
  • iron oxide
  • magnetism
  • multiferroics
  • thin films

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Ferroelectric and Magnetic Properties in Room-Temperature Multiferroic Ga<sub>x</sub>Fe<sub>2−</sub> <sub>x</sub>O<sub>3</sub> Epitaxial Thin Films'. Together they form a unique fingerprint.

Cite this