Solid state magnetic memory system and method
A solid state magnetic memory system and method disposes an array of magnetic media cells in an array on a substrate. In an exemplary embodiment, drive electronics are fabricated into the substrate through conventional CMOS processing in alignment with associated cells of the array. The magnetic media cells each include a magnetic media bit and a magnetoresistive or GMR stack for reading the state of the media bit. Addressing lines are juxtaposed with the media bits to permit programming and erasing of selected ones of the bits. In at least some embodiments, sector erase may be performed.
1. A solid state magnetic memory system comprising:
a substrate having therein drive electronics;
a magnetic media bit disposed above the substrate;
a magnetoresistive read element disposed between the magnetic media bit and the substrate;
at least one pair of write lines disposed one on either side of the magnetic media bit, the write lines receiving program signals to cause a state of the magnetic media bit to change; and
conducting lines connecting the drive electronics in the substrate to the magnetoresistive read element.
2. The solid state magnetic memory system of claim 1 wherein the substrate is formed using CMOS processing.
3. The solid state magnetic memory system of claim 1 wherein the magnetoresistive read element comprises a magnetoresistive stack.
4. The solid state magnetic memory system of claim 1 wherein the magnetoresistive read element comprises a giant magnetoresistive stack.
5. A solid state magnetic memory system comprising:
a substrate having fabricated therein drive electronics;
an array of magnetic media cells disposed on the substrate, each magnetic media cell comprising a magnetic media bit disposed above the substrate, and a magnetoresistive read element disposed between the magnetic media bit and the substrate;
at least one pair of write lines disposed one on either side of the magnetic media bit in at least most of the magnetic media cells;
at least one current source connected to the write lines for changing the state of the magnetic media bit of at least some of the magnetic media cells; and
conductive links forming a connection between the magnetic media cells and the drive electronics.
6. The solid state magnetic memory system of claim 5 wherein the magnetoresistive read element comprises a magnetoresistive stack.
7. The solid state magnetic memory system of claim 5 wherein the magnetoresistive read element comprises a giant magnetoresistive stack.
8. The solid state magnetic memory system of claim 5 wherein the drive electronics are formed by CMOS processing, and the array is formed thereover and integrated therewith.
9. The solid state magnetic memory system of claim 5 wherein the write lines are configured to allow sector erase.
10. The solid state magnetic memory system of claim 5 wherein the write lines include a first pair of write lines for programming selected cells in the array, and a second pair of write lines for erasing selected cells in the array.
11. The solid state magnetic memory system of claim 6 wherein the magnetoresistive stack is a giant magnetoresistive stack.
12. A method of fabricating a solid state magnetic memory device comprising:
fabricating, in a substrate by the use of CMOS processing, drive electronics;
depositing on the substrate in alignment with the drive electronics a magnetoresistive stack;
depositing, above the magnetoresistive stack, a magnetic media bit having first and second states, the state of the magnetic media bit being configured to be sensed by the magnetoresistive stack; and
providing at least one pair of write lines disposed one on either side of the magnetic media bit, the writs lines receiving program signals to cause the state of the magnetic media bit to change.
13. A solid state magnetic memory system comprising:
a substrate;
a magnetic media bit disposed above the substrate;
a magnetoresistive read element disposed between the magnetic media bit and the substrate;
a bit addressing line juxtaposed adjacent the media bit;
a word addressing line substantially adjacent the media bit,
the bit addressing line and the word addressing line configured to receive program signals to cause a state of the magnetic bit to change; and
conducting lines in the substrate connected to the magnetoresistive read element arranged such that the magnetic media bit is not in a conductive path with any of the lines.