Enhancement of room-temperature magnetization in GaFeO3-type single crystals by Al and Sc doping

作者：Wang, Ling; Katayama, Tsukasa^*; Wang, Chaoyue; Li, Qin; Shi, Yun; Fang, Yuqiang; Huang, Fuqiang; Zhu, Yinghao; Li, Hai-feng; Yasui, Shintaro; Huang, Xintang^*; Yu, Jianding^*

来源：AIP Advances, 2022, 12(6): 065015.

DOI：10.1063/5.0088234

• FERRIMAGNETISM
• FERROELECTRICITY
• MULTIFERROICS
• EPSILON-FE2O3

GaFeO3-type oxides are promising multiferroic materials due to the coexistence of spontaneous magnetization and ferroelectric polarization properties at room temperature. As these ferroic properties feature a large anisotropy, single crystals are required. However, the magnetization of GaFeO3-type single crystals remains low at room temperature. In this study, we largely enhanced the magnetization at room temperature of GaFeO3-type single crystals by increasing the Fe content and co-doping Sc3+ and Al3+. Single crystals of AlxSc0.1-xGa0.6Fe1.3O3 (x = 0.01-0.04) were prepared using the optical floating-zone method. The single crystals were rod-shaped, with a diameter and length of & SIM;6 mm and 7 cm, respectively. X-ray diffraction measurements confirmed the ferroelectric polarization of the crystals. In addition, they exhibited room-temperature ferrimagnetism, with Curie temperature in the range of 326-338 K; the crystals exhibit magnetic anisotropy along the a-axis. The magnetization of the single crystal at 300 K and 0.3 kOe was 13 emu g(-1), which is over ten times larger than those of previously reported single crystals with GaFeO3-type crystal structure.

• 单位
  中国科学院