MRAM read sequence using canted bit magnetization

Details MRAM read sequence using canted bit magnetization MRAM read sequence using canted bit magnetization

2007-07-24

2007-07-24

Tran, Micheal (Department: 2827)

Static information storage and retrieval

Systems using particular element

Magnetoresistive

C365S173000

Reexamination Certificate

active

11273214

ABSTRACT:
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.

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