26-01-2012 дата публикации
Номер: US20120018826A1
Автор:
A method for manufacturing a semiconductor memory device includes sequentially depositing a bottom electrode layer, a magnetic tunnel junction (MTJ) layer, a first top electrode layer, a second top electrode layer and a mask layer, etching the mask layer and forming a mask pattern, etching the second top electrode layer and the first top electrode layer by using the mask pattern as an etch barrier, etching the MTJ layer by using the mask layer and the second top electrode layer as an etch barrier, and etching the bottom electrode layer by using the first top electrode layer as an etch barrier. 1. A method for manufacturing a semiconductor memory device , comprising:depositing a bottom electrode layer, a magnetic tunnel junction (MTJ) layer, a first top electrode layer, a second top electrode layer and a mask layer;etching the mask layer and forming a mask pattern;etching the second top electrode layer and the first top electrode layer by using the mask pattern as an etch barrier;etching the MTJ layer by using the mask layer and the second top electrode layer as an etch barrier; andetching the bottom electrode layer by using the first top electrode layer as an etch barrier.2. The method according to claim 1 , wherein claim 1 , a magnetization reversal characteristic improvement layer is additionally formed between the MTJ layer and the first top electrode layer in the deposition of a bottom electrode layer claim 1 , a magnetic tunnel junction (MTJ) layer claim 1 , a first top electrode layer claim 1 , a second top electrode layer and a mask layer and undergoes the same subsequent processes after the deposition as the first top electrode layer.3. The method according to claim 2 , wherein the magnetization reversal characteristic improvement layer is formed of any one selected from the group consisting of Ru claim 2 , W claim 2 , Pt claim 2 , TIN and Ta.4. The method according to claim 1 , wherein the first top electrode layer is formed of a substance which has a high ...
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