Bit line structures for three-dimensional arrays with magnetic tunnel junction devices including an annular free magnetic layer and a planar reference magnetic layer
First Claim
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1. A memory device comprising:
- an array of Magnetic Tunnel Junction (MTJ) cells arranged in cell columns and cell rows in a plurality of cell levels, wherein the MTJ cells in corresponding cell column and cell row positions in the plurality of cell levels are coupled together in cell strings, each MTJ cell includes;
an annular structure including an annular tunnel insulator disposed about an annular free magnetic layer;
a planar reference magnetic layer disposed about the annular structure;
a planar non-magnetic insulator layer disposed on a first side of the planar reference magnetic layer and about the annular structure; and
another respective planar non-magnetic insulator layer disposed on a second side of the planar reference magnetic layer and about the annular structure.
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Abstract
A Magnetic Tunnel Junction (MTJ) can include an annular structure and a planar reference magnetic layer disposed about the annular structure. The annular structure can include an annular non-magnetic layer disposed about an annular conductive layer, an annular free magnetic layer disposed about the annular non-magnetic layer, and an annular tunnel insulator disposed about the annular free magnetic layer. The planar reference magnetic layer can be separated from the free magnetic layer by the annular tunnel barrier layer.
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Citations
35 Claims
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1. A memory device comprising:
an array of Magnetic Tunnel Junction (MTJ) cells arranged in cell columns and cell rows in a plurality of cell levels, wherein the MTJ cells in corresponding cell column and cell row positions in the plurality of cell levels are coupled together in cell strings, each MTJ cell includes; an annular structure including an annular tunnel insulator disposed about an annular free magnetic layer; a planar reference magnetic layer disposed about the annular structure; a planar non-magnetic insulator layer disposed on a first side of the planar reference magnetic layer and about the annular structure; and another respective planar non-magnetic insulator layer disposed on a second side of the planar reference magnetic layer and about the annular structure. - View Dependent Claims (2, 3, 16, 17, 26, 27, 28, 29)
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4. A device comprising:
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a first plurality of annular structures, each annular structure including an annular tunnel insulator disposed about an annular free magnetic layer; a first planar reference magnetic layer disposed about the first plurality of annular structures and separated from the free magnetic layers of the first plurality of annular structures by the annular tunnel barrier layers of the first plurality of annular structures; a first non-magnetic insulator layer disposed about the first plurality of annular structures and on a first side of the first planar reference magnetic layer; a second non-magnetic insulator layer disposed about the first plurality of annular structures and on a second side of the first planar reference magnetic layer; a second plurality of annular structures axially aligned with respective ones the first plurality of annular structures; a second planar reference magnetic layer disposed about the second plurality of annular structures and separated from the free magnetic layer of the second plurality of annular structures by the annular tunnel barrier layers of the second plurality of annular structures; a third non-magnetic insulator layer disposed about the second plurality of annular structures and between the second non-magnetic insulator layer and a first side of the second planar reference magnetic layer; and a fourth non-magnetic insulator layer disposed about the second plurality of annular structures and on a second side of the second planar reference magnetic layer. - View Dependent Claims (5, 18, 19, 30, 31, 32, 33)
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6. A memory device comprising:
an array of Magnetic Tunnel Junction (MTJ) cells arranged in a plurality of cell levels coupled together in cell strings, the MTJ cells in each cell string include; an annular structure including an annular tunnel insulator disposed about an annular free magnetic layer; corresponding planar reference magnetic layers disposed about the annular structure and aligned with a corresponding ones of the plurality of portions of the free magnetic layer; one or more planar non-magnetic insulator layers disposed on a first side of each of the plurality of planar reference magnetic layers and about the annular structure; and one or more other planar non-magnetic insulator layers disposed on a second side of each of the plurality of planar reference magnetic layers and about the annular structure. - View Dependent Claims (7, 8, 9, 10, 11, 20, 21, 22, 34)
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12. A device comprising:
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a plurality of annular structures, each annular structure including a first annular free magnetic layer and a second annular free magnetic layer separated by a non-magnetic separator layer, and an annular tunnel insulator disposed about the plurality of annular free magnetic layers and the non-magnetic separator layer; a first planar reference magnetic layer disposed about the plurality of annular structures and aligned with the first annular free magnetic layer; a first non-magnetic insulator layer disposed about the plurality of annular structures and on a first side of the first planar reference magnetic layer; and a second non-magnetic insulator layer disposed about the plurality annular structures and on a second side of the first planar reference magnetic layers; a second planar reference magnetic layer disposed about the plurality of annular structures and aligned with the second annular free magnetic layer; a third non-magnetic insulator layer disposed about the plurality of annular structures and between the second non-magnetic insulator layer and a first side of the second planar reference magnetic layer; a fourth non-magnetic insulator layer disposed about the plurality of annular structures and on a second side of the second planar reference magnetic layer. - View Dependent Claims (13, 14, 15, 23, 24, 25, 35)
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Specification