Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe₁₋<i>_x</i>Co<i>_x</i>O₃ Thin Films

Abstract

The coexistence and coupling of ferromagnetic and ferroelectric orders in a single material is crucial for realizing next-generation multifunctional applications. The coexistence of such orders is confirmed at room temperature in epitaxial thin films of BiFe_1-_x Co_x O₃ (x ≤ 0.15), which manifests a spin structure change from a low-temperature cycloidal one to a high-temperature collinear one with canted ferromagnetism.