Invention Grant
- Patent Title: Spin-transfer torque memory self-reference read and write assist methods
- Patent Title (中): 自转转矩存储器自参考读写辅助方法
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Application No.: US12372180Application Date: 2009-02-17
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Publication No.: US07826260B2Publication Date: 2010-11-02
- Inventor: Wenzhong Zhu , Yiran Chen , Xiaobin Wang , Zheng Gao , Haiwen Xi , Dimitar V. Dimitrov
- Applicant: Wenzhong Zhu , Yiran Chen , Xiaobin Wang , Zheng Gao , Haiwen Xi , Dimitar V. Dimitrov
- Applicant Address: US CA Scotts Valley
- Assignee: Seagate Technology LLC
- Current Assignee: Seagate Technology LLC
- Current Assignee Address: US CA Scotts Valley
- Agency: Campbell Nelson Whipps, LLC
- Main IPC: G11C11/14
- IPC: G11C11/14

Abstract:
A spin-transfer torque memory apparatus and self-reference read and write assist schemes are described. One method of self-reference reading a spin-transfer torque memory unit includes applying a first read current through a magnetic tunnel junction data cell and forming a first bit line read voltage and storing the first bit line read voltage. A magnetic field is applied through the free magnetic layer the forming a magnetic field modified magnetic tunnel junction data cell, the magnetic field rotates the magnetization orientation of the free magnetic layer without switching a resistance state of the magnetic tunnel junction data cell. Then a second read current is applied thorough the magnetic field modified magnetic tunnel junction data cell forming a second bit line read voltage and the bit line read voltage is stored and compared with the first bit line read voltage to determine whether the first resistance state of the magnetic tunnel junction data cell was a high resistance state or low resistance state. Methods of applying a destabilizing magnetic field to the MTJ and then writing the desired resistance state are also disclosed.
Public/Granted literature
- US20100103728A1 SPIN-TRANSFER TORQUE MEMORY SELF-REFERENCE READ AND WRITE ASSIST METHODS Public/Granted day:2010-04-29
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