MRAM read bit with askew fixed layer

Details MRAM read bit with askew fixed layer MRAM read bit with askew fixed layer

2006-03-15

2009-06-16

Le, Vu A (Department: 2824)

Static information storage and retrieval

Systems using particular element

Magnetic thin film

C365S173000

Reexamination Certificate

active

07548452

ABSTRACT:
A new read scheme is provided for an MRAM bit having a reference layer (fixed) and a storage layer (free) sandwiching a nonmagnetic spacer layer. The reference layer has a magnetization direction that is tilted with respect to an easy axis of the storage layer. By applying a magnetic field to the bit at least partially orthogonal to the easy axis, 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.

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