发明申请
- 专利标题: STRUCTURE AND METHOD TO REDUCE SHORTING AND PROCESS DEGRADATION IN STT-MRAM DEVICES
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申请号: US15906154申请日: 2018-02-27
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公开(公告)号: US20180190900A1公开(公告)日: 2018-07-05
- 发明人: Anthony J. Annunziata , Gen P. Lauer , Janusz J. Nowak , Eugene J. O'Sullivan
- 申请人: International Business Machines Corporation
- 主分类号: H01L43/08
- IPC分类号: H01L43/08 ; H01L43/12
摘要:
A method of making a magnetic random access memory device includes forming a magnetic tunnel junction (MTJ) on an electrode, the MTJ including a reference layer, a tunnel barrier layer, and a free layer; disposing a hard mask on the MTJ; etching sidewalls of the hard mask and MTJ to form a stack with a first width and redeposit metal along the MTJ sidewall; depositing a sacrificial dielectric layer on the hard mask, surface of the electrode, exposed sidewall of the hard mask and the MTJ, and on redeposited metal along the sidewall of the MTJ; removing a portion of the sacrificial dielectric layer from sidewalls of the hard mask and MTJ and redeposited metal from the MTJ sidewalls; and removing a portion of a sidewall of the MTJ and hard mask to provide a second width to the stack; wherein the second width is less than the first width.
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