Patent ID: 9293698
Filing Date: 2016-03-22
CPC Classification: B82Y,H01L,Y10S

Claim Text:
1. A method of manufacturing a tunnel barrier of a magnetoresistive structure including first and second ferromagnetic layers, wherein the tunnel barrier is disposed between the first and second ferromagnetic layers, the method comprising: depositing a first metal material over the first ferromagnetic layer; oxidizing at least a portion of the first metal material to a first oxidation dose to provide a first metal oxide; depositing a second metal material over the first metal oxide; oxidizing at least a portion of the second metal material to a second oxidation dose to provide a second metal oxide, wherein the second oxidation dose is greater than the first oxidation dose; depositing a third metal material over the second metal oxide; and oxidizing at least a portion of the third metal material to a third oxidation dose to provide a third metal oxide, wherein the third oxidation dose is less than the second oxidation dose.