- 专利标题: High density spin-transfer torque MRAM process
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申请号: US12930333申请日: 2011-01-04
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公开(公告)号: US20110101478A1公开(公告)日: 2011-05-05
- 发明人: Tom Zhong , Chyu-Jiuh Torng , Rongfu Xiao , Adam Zhong , Wai-Ming Johnson Kan , Daniel Liu
- 申请人: Tom Zhong , Chyu-Jiuh Torng , Rongfu Xiao , Adam Zhong , Wai-Ming Johnson Kan , Daniel Liu
- 专利权人: MagIC Technologies, Inc.
- 当前专利权人: MagIC Technologies, Inc.
- 主分类号: H01L29/82
- IPC分类号: H01L29/82
摘要:
A STT-MRAM integration scheme is disclosed wherein the connection between a MTJ and CMOS metal is simplified by forming an intermediate via contact (VAC) on a CMOS landing pad, a metal (VAM) pad that contacts and covers the VAC, and a MTJ on the VAM. A dual damascene process is performed to connect BIT line metal to CMOS landing pads through VAC/VAM/MTJ stacks in a device region, and to connect BIT line connection pads to CMOS connection pads through BIT connection vias outside the device region. The VAM pad is a single layer or composite made of Ta, TaN, or other conductors which serves as a diffusion barrier, has a highly smooth surface for MTJ formation, and provides excellent selectivity with refill dielectric materials during a chemical mechanical polish process. Each VAC is from 500 to 3000 Angstroms thick to minimize additional circuit resistance and minimize etch burden.
公开/授权文献
- US08324698B2 High density spin-transfer torque MRAM process 公开/授权日:2012-12-04
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