Magnetic Domain Wall Motion Element With Antiferromagnetic Layer Coupling

The magnetization fixed portions are segmented into multiple layers (first magnetization fixed layer, second magnetization fixed layer, third magnetization fixed layer) with different magnetization orientation directions. Each layer can be independently controlled and oriented, allowing different regions to have different magnetization directions (e.g., in-plane and out-of-plane) without affecting the entire structure's stability. This segmentation enables multi-level data storage while maintaining manufacturing reliability through independent layer optimization.

The patent employs composite magnetic layer structures where ferromagnetic layers with different magnetization characteristics are combined with nonmagnetic spacer layers and antiferromagnetic coupling layers. This composite structure allows different layers to contribute different magnetic properties (e.g., perpendicular magnetic anisotropy in one layer, in-plane anisotropy in another), achieving multi-directional magnetization orientation capability while maintaining overall structural stability and manufacturing reliability.

The complex magnetization control function is segmented across multiple thin layers, where each layer has a specific, simplified function (e.g., one layer provides perpendicular anisotropy, another provides in-plane anisotropy, spacer layers provide decoupling). This segmentation transforms a single complex control mechanism into multiple simple, independent layer functions that are easier to manufacture and control separately.

Different regions of the magnetization fixed structure are designed with locally optimized properties - certain layers are engineered with specific thicknesses and materials to provide particular magnetization orientations (in-plane or out-of-plane) as needed. This local quality approach allows precise magnetization control in different parts of the structure without requiring the entire structure to be uniformly complex.