Invention Application
- Patent Title: MRAM Write Pulses to Dissipate Intermediate State Domains
- Patent Title (中): MRAM写脉冲消散中间状态域
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Application No.: US13899623Application Date: 2013-05-22
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Publication No.: US20140347918A1Publication Date: 2014-11-27
- Inventor: Yuan-Jen Lee , Po-Kang Wang , Guenole Jan
- Applicant: Headway Technologies, Inc.
- Applicant Address: US CA Milpitas
- Assignee: Headway Technologies, Inc.
- Current Assignee: Headway Technologies, Inc.
- Current Assignee Address: US CA Milpitas
- Main IPC: G11C5/00
- IPC: G11C5/00

Abstract:
A write method for a STT-RAM MTJ is disclosed that substantially reduces the bit error rate caused by intermediate domain states generated during write pulses. The method includes a plurality of “n” write periods or pulses and “n−1” domain dissipation periods where a domain dissipation period separates successive write periods. During each pulse, a write current is applied in a first direction across the MTJ and during each domain dissipation period, a second current with a magnitude equal to or less than the read current is applied in an opposite direction across the MTJ. Alternatively, no current is applied during one or more domain dissipation periods. Each domain dissipation period has a duration of 1 to 10 ns that is equal to or greater than the precession period of free layer magnetization in the absence of spin torque transfer current.
Public/Granted literature
- US09343132B2 MRAM write pulses to dissipate intermediate state domains Public/Granted day:2016-05-17
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