Presentation Information
[10a-N206-9]Control of APB Defects in Spinel Ferrite Thin Films via Post-Oxidation
Kouki Takeo1, Eiji Kita1, 〇Hideto Yanagihara1 (1.Univ. of Tsukuba)
Keywords:
anti-phase boundary,spinel ferrite
Spinel ferrite thin films grown on MgO(001) substrates often suffer from a high density of antiphase boundaries (APBs), which degrade magnetic properties by forming magnetically inactive layers near the interface. In this study, we investigated a post-oxidation annealing strategy to suppress APBs in cobalt ferrite (CFO) thin films. Films were deposited using reactive RF magnetron sputtering under different oxygen flow rates, and post-annealed at 450°C in an O2/Ar plasma atmosphere. Structural and magnetic characterizations showed that post-oxidized films exhibited increased domain size and enhanced saturation magnetization. Mössbauer spectroscopy revealed oxidation of Fe2+ to Fe3+, indicating cation rearrangement and lattice reconstruction. These results demonstrate that post-oxidation effectively reduces APB density and improves magnetic performance in spinel ferrite thin films.