MTJ Free Layer Nano-Pore Structure for Lower Saturation Magnetization

The patent introduces a porous insulation layer within the storage layer structure. This porous layer has low density and high porosity, which reduces the overall saturation magnetization of the storage layer without requiring thickness reduction. The porous structure prevents agglomeration by providing spatial separation between magnetic particles, thus resolving the contradiction between reducing saturation magnetization and preventing agglomeration.

The patent uses a porous insulation layer made from existing materials (such as porous oxides or carbons) that can be deposited using standard semiconductor fabrication processes. This approach reduces saturation magnetization without introducing entirely new material systems, thereby minimizing the increase in device complexity while achieving the desired magnetization reduction.

The porous insulation layer acts as a magnetic spacer that reduces magnetic coupling between adjacent magnetic particles. By introducing this porous layer, the patent reduces saturation magnetization while simultaneously minimizing magnetic interference through the insulating properties of the porous material, thus resolving the contradiction between magnetization reduction and interference minimization.