Patent ID: 11882769
Assignee: WINBOND ELECTRONICS CORP.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A magnetoresistive random access memory (MRAM) structure, comprising:
multiple MRAM cells, wherein each said MRAM cell comprises:
a bottom electrode layer on a substrate;
a magnetic tunnel junction stack on said bottom electrode layer; and
a top electrode layer on said magnetic tunnel junction stack;
an atomic deposition layer at outer sides of said MRAM cells and between said MRAM cells;
wherein a material of said top electrode layer is titanium nitride, and a nitrogen percentage is greater than a titanium percentage and further greater than an oxygen percentage in said titanium nitride, and said nitrogen percentage gradually increases inward from a top surface of said top electrode layer to a depth and then start to gradually decrease to a first level and then remains constant, and said titanium percentage gradually decreases inward from said top surface of said top electrode layer to said depth and then start to gradually increase to a second level and then remains constant.