MRAM cell using multiple axes magnetization and method of operation
First Claim
Patent Images
1. A magnetic random access memory cell, comprising:
- a reference layer structure that includes an anti-ferromagnetic layer structure pinning a magnetization orientation of the reference layer structure, the reference layer structure being magnetically polarizable bidirectional and parallel to more than one axis by a magnetic field applied during a writing procedure so as to store information in the reference layer structure while heating the anti-ferromagnetic layer structure above its blocking temperature; and
a free layer structure adjacent the reference layer structure, the reference layer structure having a higher magnetic coercivity than the free layer structure.
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Abstract
A magnetic random access memory cell includes a free layer structure and a reference layer structure including an anti-ferromagnetic layer structure pinning the magnetization orientation of the reference layer structure, the reference layer structure having a higher magnetic coercivity and being magnetically polarizable bidirectional and parallel to more than one axes by a magnetic field applied during a writing procedure so as to store information in the reference layer structure while heating the anti-ferromagnetic layer structure above its blocking temperature.
46 Citations
40 Claims
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1. A magnetic random access memory cell, comprising:
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a reference layer structure that includes an anti-ferromagnetic layer structure pinning a magnetization orientation of the reference layer structure, the reference layer structure being magnetically polarizable bidirectional and parallel to more than one axis by a magnetic field applied during a writing procedure so as to store information in the reference layer structure while heating the anti-ferromagnetic layer structure above its blocking temperature; and a free layer structure adjacent the reference layer structure, the reference layer structure having a higher magnetic coercivity than the free layer structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetic random access memory cell, comprising:
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a reference layer structure that includes an anti-ferromagnetic layer structure pinning a magnetization orientation of the reference layer structure; a free layer structure; and a non-magnetic tunnel barrier layer structure disposed between the reference layer structure and the free layer structure, the reference layer structure having a higher magnetic coercivity than the free layer structure and the reference layer structure being magnetically polarizable bidirectional parallel to a magnetic field generated by a bit line electrode and parallel to a magnetic field generated by a word line electrode during a writing procedure so as to store information in the reference layer structure while heating the anti-ferromagnetic layer structure above its blocking temperature. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of writing to a magnetic access memory cell, the method comprising:
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providing a magnetic access memory cell that includes a free layer structure adjacent a reference layer structure; applying a magnetic field thereby polarizing the reference layer structure in one of two possible directions parallel to one out of more than one possible axes so as to store information in the reference layer structure. - View Dependent Claims (30, 31, 32, 33)
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34. A method of reading a magnetic access memory cell, the method comprising:
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providing a magnetic access memory cell that includes a free layer structure adjacent a reference layer structure; applying a magnetic field thereby polarizing the free layer structure parallel to each axis of a plurality of axes; and determining a tunnel magneto resistance status of the magnetic access memory cell.
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35. A method of operating a magnetic access memory cell for reading, the method comprising:
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providing a magnetic access memory cell that includes a free layer structure adjacent a reference layer structure; applying a magnetic field thereby polarizing the free layer structure parallel to an axis of a plurality of axes; and determining an axis aligned tunnel magneto resistance status, as long as the axis aligned tunnel magneto resistance status represents neither a logical ‘
0’
state nor a logical ‘
1’
state, applying a magnetic field polarizing the free layer structure parallel to an other axis of the plurality of axes and determining the axis aligned tunnel magneto resistance status. - View Dependent Claims (36, 37, 38)
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39. A method of operating a magnetic access memory cell for reading, the method comprising:
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pulsing a field current through a bit line electrode; pulsing a first read current through the magnetic access memory cell for determining a first axis aligned tunnel magneto resistance status; pulsing a field current through a word line electrode; and pulsing a second read current through the magnetic access memory cell for determining a second axis aligned tunnel magneto resistance status. - View Dependent Claims (40)
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Specification