Perpendicular Magnetization Oxide Interface Iron Magnetic Layer

The patent employs a composite structure consisting of a magnetic layer containing iron combined with oxide layers at the interfaces. This composite material approach creates perpendicular magnetic anisotropy through the interaction between iron and oxygen at the interfaces, achieving high anisotropy energy density without requiring overly complex device architectures. The composite nature of the magnetic layer (including iron and other elements) further enhances the anisotropy while maintaining fabrication feasibility.

The patent applies local quality by concentrating the magnetic anisotropy generation at the specific locations where oxide layers contact the magnetic layer. Instead of relying on bulk properties throughout the entire magnetic layer, the perpendicular magnetic anisotropy is localized at the interfaces between the magnetic layer and oxide layers. This allows thin magnetic layers to maintain high thermal activation energy barriers through the localized interfacial anisotropy, enabling device scaling while preserving thermal stability.

The patent transitions from a single oxide interface to multiple oxide interfaces by introducing oxide layers at both the top and bottom of the magnetic layer. This dimensional expansion from one interface to two interfaces creates additional sources of perpendicular magnetic anisotropy, significantly enhancing the overall anisotropy energy density. The dual-interface structure effectively doubles the interfacial area contributing to perpendicular anisotropy, resolving the insufficiency of single-interface designs.