Invention Grant
- Patent Title: High density spin-transfer torque MRAM process
- Patent Title (中): 高密度自旋转移力矩MRAM工艺
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Application No.: US12931648Application Date: 2011-02-07
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Publication No.: US08183061B2Publication Date: 2012-05-22
- Inventor: Tom Zhong , Chyu-Jiuh Torng , Rongfu Xiao , Adam Zhong , Wai-Ming Johnson Kan , Daniel Liu
- Applicant: Tom Zhong , Chyu-Jiuh Torng , Rongfu Xiao , Adam Zhong , Wai-Ming Johnson Kan , Daniel Liu
- Applicant Address: US CA Milpitas
- Assignee: MagIC Technologies, Inc.
- Current Assignee: MagIC Technologies, Inc.
- Current Assignee Address: US CA Milpitas
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman
- Main IPC: H01L21/441
- IPC: H01L21/441

Abstract:
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.
Public/Granted literature
- US20110129946A1 High density spin-transfer torque MRAM process Public/Granted day:2011-06-02
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