Invention Grant
- Patent Title: Spin transfer MRAM device with separated CCP assisted writing
- Patent Title (中): 旋转传输MRAM设备,分离CCP辅助写入
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Application No.: US12462453Application Date: 2009-08-04
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Publication No.: US07755933B2Publication Date: 2010-07-13
- Inventor: Yimin Guo , Jeff Chien
- Applicant: Yimin Guo , Jeff Chien
- 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: G11C11/00
- IPC: G11C11/00

Abstract:
A spin-transfer MRAM is described that has two sub-cells each having a conductive spacer between an upper CPP cell and a lower MTJ cell. The two conductive spacers in each bit cell are linked by a transistor which is controlled by a write word line. The two CPP cells in each bit cell have different resistance states and the MTJ cell and CPP cell in each sub-cell have different resistance states. The MTJ free layer rotates in response to switching in the CPP free layer because of a large demagnetization field exerted by the CPP free layer. An improved circuit design is disclosed that enables a faster and more reliable read process since the reference is a second MTJ within the same bit cell. When RMTJ1>RMTJ2, the bit cell has a “0” state, and when RMTJ1
Public/Granted literature
- US20090296455A1 Spin transfer MRAM device with separated CCP assisted writing Public/Granted day:2009-12-03
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