- 专利标题: MRAM read sequence using canted bit magnetization
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申请号: US11273214申请日: 2005-11-14
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公开(公告)号: US07248496B2公开(公告)日: 2007-07-24
- 发明人: Romney R. Katti , Owen J. Hynes , Daniel S. Reed , Hassan Kaakani
- 申请人: Romney R. Katti , Owen J. Hynes , Daniel S. Reed , Hassan Kaakani
- 申请人地址: US NJ Morristown
- 专利权人: Honeywell International Inc.
- 当前专利权人: Honeywell International Inc.
- 当前专利权人地址: US NJ Morristown
- 代理机构: McDonnell Boehnen Hulbert & Berghoff LLP
- 主分类号: G11C7/00
- IPC分类号: G11C7/00
摘要:
A new read scheme is provided for an MRAM bit having a pinned layer (fixed) and a storage layer (free) sandwiching a nonmagnetic spacer layer. By applying a magnetic field to the bit at least partially orthogonal to the easy axis of the bit, the magnetization direction of the storage layer can be partially rotated or canted without switching the logical state of the MRAM bit. The resistivity of the bit is measured (calculated based on a voltage/current relationship) in two ways: (i) with the magnetization direction of the storage layer partially rotated in a first direction and (ii) with the magnetization direction of the storage layer in its bi-stable orientation parallel to the easy axis. Those measures can then be used to compare and determine the logical state of the storage layer. For instance, if the canted resistivity is greater than the uncanted resistivity then the magnetization directions of the pinned and storage layer are parallel, and if the canted resistivity is less than the uncanted resistivity then the magnetization directions of the pinned and storage layer are opposite.
公开/授权文献
- US20070109839A1 MRAM read sequence using canted bit magnetization 公开/授权日:2007-05-17
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