Invention Grant
- Patent Title: Redundant magnetic tunnel junctions in magnetoresistive memory
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Application No.: US15406684Application Date: 2017-01-14
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Publication No.: US09721632B2Publication Date: 2017-08-01
- Inventor: Dimitri Houssameddine , Jon Slaughter
- Applicant: Everspin Technologies, Inc.
- Applicant Address: US AZ Chandler
- Assignee: Everspin Technologies, Inc.
- Current Assignee: Everspin Technologies, Inc.
- Current Assignee Address: US AZ Chandler
- Main IPC: G11C11/00
- IPC: G11C11/00 ; G11C11/16

Abstract:
Memory cells in a spin-torque magnetic random access memory (MRAM) include at least two magnetic tunnel junctions within each memory cell, where each memory cell only stores a single data bit of information. Access circuitry coupled to the memory cells are able to read from and write to a memory cell even when one of the magnetic tunnel junctions within the memory cell is defective and is no longer functional. Self-referenced and referenced reads can be used in conjunction with the multiple magnetic tunnel junction memory cells. In some embodiments, writing to the memory cell forces all magnetic tunnel junctions into a known state, whereas in other embodiments, a subset of the magnetic tunnel junctions are forced to a known state.
Public/Granted literature
- US20170133073A1 REDUNDANT MAGNETIC TUNNEL JUNCTIONS IN MAGNETORESISTIVE MEMORY Public/Granted day:2017-05-11
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