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

Claim 7:
8. A magnetic random access memory (MRAM) cell, comprising:
a plurality of stacked magnetic tunnel junction (MTJ) devices coupled in serial; and
a transistor having a gate coupled to a word line, a first terminal coupled to a bit line through the stacked MTJ devices, and a second terminal coupled to a source line,
wherein each of the stacked MTJ devices comprises a free layer, a pinned layer and a barrier layer between the free layer and the pinned layer,
wherein a first stacked MTJ device of the stacked MTJ devices is directly coupled to the transistor,
wherein the free layers of two adjacent stacked MTJ devices between the first stacked MTJ device and the bit line are in direct contact with each other,
wherein size of the first stacked MTJ device is greater than that of the two adjacent stacked MTJ devices.