Spin transfer torque cell for magnetic random access memory
First Claim
1. A method for manufacturing a spin transfer torque (STT) magnetic random access memory (MRAM) device, the method comprising:
- forming at least one conductive via over a first electrode;
forming a first insulator over the first electrode;
forming a second insulator over the first insulator, where the first and second insulators contact the at least one conductive via;
depositing over the at least one conductive via and the second insulator a magnetic tunnel junction (MTJ) stack including at least a free layer; and
forming a seed layer directly between the at least one conductive via and the free layer of the MTJ stack, the free layer including an excess agent;
wherein the second insulator delivers the excess agent to enable a chemical reaction between the free layer of the MTJ stack and the second insulator.
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Accused Products
Abstract
Embodiments are directed to STT MRAM devices. One embodiment of an STT MRAM device includes a reference layer, a tunnel barrier layer, a free layer and one or more conductive vias. The reference layer is configured to have a fixed magnetic moment. In addition, the tunnel barrier layer is configured to enable electrons to tunnel between the reference layer and the free layer through the tunnel barrier layer. The free layer is disposed beneath the tunnel barrier layer and is configured to have an adaptable magnetic moment for the storage of data. The conductive via is disposed beneath the free layer and is connected to an electrode. Further, the conductive via has a width that is smaller than a width of the free layer such that a width of an active STT area for the storage of data in the free layer is defined by the width of the conductive via.
21 Citations
9 Claims
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1. A method for manufacturing a spin transfer torque (STT) magnetic random access memory (MRAM) device, the method comprising:
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forming at least one conductive via over a first electrode; forming a first insulator over the first electrode; forming a second insulator over the first insulator, where the first and second insulators contact the at least one conductive via; depositing over the at least one conductive via and the second insulator a magnetic tunnel junction (MTJ) stack including at least a free layer; and forming a seed layer directly between the at least one conductive via and the free layer of the MTJ stack, the free layer including an excess agent; wherein the second insulator delivers the excess agent to enable a chemical reaction between the free layer of the MTJ stack and the second insulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification