Patent ID: 11963463
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 13:
14. A magnetic random access memory (MRAM), comprising:
a plurality of memory cells arranged in a memory array, wherein each of the memory cells comprises a plurality of magnetic tunnel junction (MTJ) devices coupled in series for storing multiple-bit data,
wherein in each of the memory cells, the MTJ devices are stacked and coupled between a respective bit line and a respective source line, and the MTJ devices have different sizes,
wherein in each of the memory cells, each of the MTJ devices comprises a free layer, a pinned layer and a barrier layer between the free layer and the pinned layer,
wherein in each of the memory cells, the free layers of two adjacent MTJ devices are in direct contact with each other.