Patent ID: 9059398
Filing Date: 2015-06-16
Classification: G11C,H01L

Abstract:
1. A method of forming a magnetic tunnel junction structure on a substrate, comprising: placing a substrate having an insulating tunneling layer disposed between a first and a second ferromagnetic layer disposed on the substrate in a processing chamber, wherein the first ferromagnetic layer is disposed on the substrate followed by the insulating tunneling layer and the second ferromagnetic layer sequentially; supplying an ion implantation gas mixture into the processing chamber to implant ions into the first ferromagnetic layer exposed by openings defined by the second ferromagnetic layer in the processing chamber; and etching the implanted first ferromagnetic layer by an etching gas mixture including hydrocarbon gas and nitrogen containing gas through the openings defined by the second ferromagnetic layer in the same processing chamber, wherein the second ferromagnetic layer serves as an etching mask while etching the first ferromagnetic layer.