The coexistence of ferrimagnetic and ferroelectric orders in ε-Fe₂O₃ at room temperature makes it a promising multiferroic material. However, to investigate and enhance the ferroic functionalities, single crystals of this oxide must be synthesized. In this study, we successfully synthesized ε-Fe₂O₃-type single crystals, which exhibited room-temperature ferrimagnetism and spontaneous ferroelectric polarization simultaneously by codoping ε-Fe₂O₃ with Ga³⁺ and Sc³⁺. Using a floating zone method, large (diameter of ∼6 mm and length of ∼70 mm) and high-quality ε-Sc_xGa_0.75–xFe_1.25O₃ (x = 0.05–0.15) single-crystal rods were obtained. The crystals exhibited strong magnetic anisotropy along the a-axis at 300 K. The magnetic transition temperature and the coercive field at 300 K decreased with increasing x. In addition, magnetic-field-induced modulation of the polarization was observed at a relatively high temperature (150 K) with a magnetoelectric coefficient of (2–5) × 10^–11 S/m.

中文翻译：

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具有室温亚铁磁性和铁电极极化的 ε-Fe2O3 型氧化物的单晶合成

室温下ε-Fe ₂ O ₃中亚铁磁性和铁电有序的共存使其成为一种很有前途的多铁性材料。然而，为了研究和增强铁的功能，必须合成这种氧化物的单晶。在本研究中，我们通过将ε-Fe ₂ O ₃与Ga ³⁺和Sc ³⁺共掺杂，成功合成了ε-Fe ₂ O ₃型单晶，该单晶同时表现出室温亚铁磁性和自发铁电极化。使用浮区法，大（直径约 6 毫米，长度约 70 毫米）和高质量 ε-Sc _x Ga _{0.75 –x}获得了 Fe _1.25 O ₃ ( x = 0.05–0.15) 单晶棒。晶体在 300 K 时沿a轴表现出强磁各向异性。磁转变温度和 300 K 时的矫顽场随着x 的增加而降低。此外，在相对较高的温度 (150 K) 下观察到磁场诱导的极化调制，磁电系数为 (2–5) × 10 ^–11 S/m。