MBE growth and magnetic behaviors in epitaxial Fe<sub>100-x</sub>Ga<sub>x</sub> on SrTiO<sub>3</sub>

ORAL

Abstract

Recently, Iron-gallium alloy (Fe100-xGax with 0x30) is a promising material for magnetostrictive applications due to its high tetragonal magnetostriction 100 at low magnetic field. Thus, we present understanding about structural and magnetic properties of disordered bcc-Fe crystal structure Fe100-xGax (x = 10, 20, and 30) epitaxial thin films, grown on a piezoelectric SrTiO3 substrate using molecular beam epitaxy. The lattice parameter increases with Ga alloying content, because the Ga atom's atomic radius is larger than the Fe atom's. The films showed metallic behavior with a decrease in electrical resistivity at room temperature with Ga content, due to the increase in carrier density. The room temperature saturation magnetization decreased, from 1575 to 991 emu/cm3 as Ga concentration increased from 10 to 30%. Interestingly, a two-step-hysteresis loop was observed in all samples. Magneto-optical Kerr images confirmed abnormal magnetic domain switching under an applied magnetic field. Specifically, the hysteresis loop of the film with a 10% Ga concentration reveals an obvious kink, whereas the loop of the film with a 30% Ga content is harder to see. As a results, it is possible to modify the magnetic properties of FeGa film by combining it with SrTiO3, a complex ABO3 perovskite oxide with a high piezoelectric constant. Our findings suggested that FeGa is a promising material for controlling magnetic anisotropy using a piezoelectric layer in magnetoelastic coupling devices.

*This study was supported by the National Research Foundation of Korea [Grant No. NRF-2021M3F3A2A01037663 and NRF-2022M3H4A1A04071154]. This study also was supported by the National Research Foundation of Korea [NRF-2019R1A6A1A11053838, NRF-2020K1A4A7A02095438, and NRF-2022R1A2C1091734].

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Presenters

  • Tran Thi Toan

    • Korea Research Institute Standards and Science

Authors

  • Tran Thi Toan

    • Korea Research Institute Standards and Science