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<p>FeMn<sub>2</sub>O<sub>4-δ</sub> epitaxial films were grown on a MgO (100) substrate by using molecular beam epitaxy (MBE) at low growth temperature from 100 to 300&#xa0;°C in oxygen-cracked environment. The results shows that the structural properties of films are single crystalline with flat surface at growth temperatures of 200&#xa0;°C. The tensile strain of films decrease as growth temperature increase which is confirmed by X-ray diffraction characterization. The optical band gaps of films are 3.44, 3.50, and 3.20&#xa0;eV with growth temperatures of 100&#xa0;°C, 200&#xa0;°C, and 300&#xa0;°C, respectively. In addition, the films possess magnetic properties in ferrimagnetic ordering at room temperature without any magnetic transition below this temperature; magnetization of films decreases as growth temperature increase. The results average magnetic moment per unit are estimated to be 3.72, 2.84, and 2.13 µ<sub>B</sub>/f.u corresponding to 100&#xa0;°C, 200&#xa0;°C, and 300&#xa0;°C of growth temperature. Our work provides a study on structural and magnetic properties of FeMn<sub>2</sub>O<sub>4-δ</sub> in thin film form, which has potential application in fabrication of spin-filter devices.</p>

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Ferrimagnetism state in FeMn2O4-δ epitaxial films on MgO(100) substrate

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Duong Van Thiet,
  • Nguyen Xuan Chung,
  • Nguyen Quoc Tuan,
  • Nguyen Tien Tung,
  • Ha Thanh Hai,
  • Do Ngoc Tu,
  • Sunglae Cho

摘要

FeMn2O4-δ epitaxial films were grown on a MgO (100) substrate by using molecular beam epitaxy (MBE) at low growth temperature from 100 to 300 °C in oxygen-cracked environment. The results shows that the structural properties of films are single crystalline with flat surface at growth temperatures of 200 °C. The tensile strain of films decrease as growth temperature increase which is confirmed by X-ray diffraction characterization. The optical band gaps of films are 3.44, 3.50, and 3.20 eV with growth temperatures of 100 °C, 200 °C, and 300 °C, respectively. In addition, the films possess magnetic properties in ferrimagnetic ordering at room temperature without any magnetic transition below this temperature; magnetization of films decreases as growth temperature increase. The results average magnetic moment per unit are estimated to be 3.72, 2.84, and 2.13 µB/f.u corresponding to 100 °C, 200 °C, and 300 °C of growth temperature. Our work provides a study on structural and magnetic properties of FeMn2O4-δ in thin film form, which has potential application in fabrication of spin-filter devices.