The Problem:
MRAM currently utilizing ferromagnetic materials does not incorporate Heusler alloys in a superlattice configuration. The absence of this configuration limits the spin polarization which leads to the need for a larger power supply. Additionally, this effectively limits the scalability of the memory.
The Solution:
The novel technology utilizes two or more Heusler alloys (ferromagnetic alloys based on intermetallics with a particular composition and structure) and stacks them to form a superlattice (two or more alternating layers of superconducting materials. The layering of the Heusler alloys allows for uniaxial magneto crystalline anisotropy – through increasing spin polarization and improving the half-metallic properties. These improvements address the requirements of Spin-Torque Transfer MRAM – requiring lower power and allowing for improved scalability of this type of memory.
Heusler Compound
Superlattice structure example
Benefits:
• High spin polarization.
• Perpendicular anisotropy.
• Lower power needed for MRAM.
• Better scalability.
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