Invention Grant
- Patent Title: Reverse connection MTJ cell for STT MRAM
- Patent Title (中): 用于STT MRAM的反向连接MTJ单元
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Application No.: US12626092Application Date: 2009-11-25
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Publication No.: US08416600B2Publication Date: 2013-04-09
- Inventor: Chun-Jung Lin , Yu-Jen Wang , Ya-Chen Kao , Wen-Cheng Chen , Ming-Te Liu
- Applicant: Chun-Jung Lin , Yu-Jen Wang , Ya-Chen Kao , Wen-Cheng Chen , Ming-Te Liu
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Haynes and Boone, LLP
- Main IPC: G11C11/00
- IPC: G11C11/00

Abstract:
Apparatus and methods are disclosed herein for a reverse-connection STT MTJ element of a MRAM to overcome the source degeneration effect when switching the magnetization of the MTJ element from the parallel to the anti-parallel direction. A memory cell of a MRAM having a reverse-connection MTJ element includes a switching device having a source, a gate, and a drain, and a reverse-connection MTJ device having a free layer, a fixed layer, and an insulator layer interposed between the free layer and the fixed layer. The free layer of the reverse-connection MTJ device is connected to the drain of the switching device and the fixed layer is connected to a bit line (BL). The reverse-connection MTJ device applies the lower IMTJ capability of the memory cell caused by the source degeneration effect to the less stringent IMTJ(AP->P) while preserving the higher IMTJ capability for the more demanding IMTJ(P->AP).
Public/Granted literature
- US20110122674A1 REVERSE CONNECTION MTJ CELL FOR STT MRAM Public/Granted day:2011-05-26
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