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

Claim 7:
8. A method of manufacturing a magnetoresistive random access memory (MRAM), comprising:
providing a substrate;
forming a bottom electrode layer, a magnetic tunnel junction stack and a top electrode layer sequentially on said substrate;
patterning said bottom electrode layer, said magnetic tunnel junction stack and said top electrode layer into multiple MRAM cells;
depositing an atomic deposition layer on said MRAM cells and said substrate, wherein said atomic deposition layer fills up gaps between said MRAM cells;
performing an etch back process to said atomic deposition layer to remove said atomic deposition layer on said top electrode layer and said substrate, so that said atomic deposition layer remains only on outer sides of said MRAM cells and between said MRAM cells; and
performing a wet clean process to said MRAM cells after said etch back process;
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.