Die surface magnetic field shield
View Patent ↗A semiconductor topography is provided which includes a magnetic field shield layer formed upon a semiconductor device. In particular, the semiconductor topography may include a ferromagnetic layer adapted to shield underlying layers from external magnetic fields. Such a ferromagnetic layer may include either ferrite and/or non-ferrite materials. In some embodiments, the semiconductor topography may include a magnetic field shield layer with a different pattern configuration than an adjacent passivation layer. Consequently, a method for processing a semiconductor topography which includes patterning a magnetic field shield layer to form openings other than bond pad openings within the semiconductor topography is provided.
1. A semiconductor topography comprising:
a magnetic field shield layer with a different pattern configuration than an adjacent passivation layer; and
a magnetoresistive memory cell arranged below the magnetic field shield layer, wherein the pattern configuration of the magnetic field shield layer comprises portions of the magnetic field shield layer aligned at an angle greater than approximately 0 degrees and less than approximately 90 degrees relative to an elongated dimension of the magnetoresistive memory cell.
2. The semiconductor topography of claim 1 , further comprising another magnetic field shield layer arranged in alignment with the elongated dimension of the magnetoresistive memory cell.
3. The semiconductor topography of claim 1 , further comprising another magnetic field shield layer arranged in alignment with a shortened dimension of the magnetoresistive memory cell.
4. The semiconductor topography of claim 1 , wherein the magnetic field shield layer comprises a ferromagnetic material.
5. A semiconductor topography comprising:
a magnetoresistive memory cell;
a ferromagnetic layer adapted to shield the magnetoresistive memory cell from external magnetic fields; and
a passivation layer arranged above the ferromagnetic layer, and spanning the entirety of the semiconductor topography with exception to a region comprising a bond pad of the topography.
6. The semiconductor topography of claim 5 , wherein the ferromagnetic layer is further adapted to protect underlying layers of the semiconductor topography from moisture.
7. The semiconductor topography of claim 5 , wherein the ferromagnetic layer comprises a different patterned configuration than the passivation layer.
8. The semiconductor topography of claim 5 , comprising one or more additional layers adapted to shield the magnetoresistive memory cell from external magnetic fields.
9. The semiconductor topography of claim 8 , wherein the ferromagnetic layer and the one or more additional layers are spaced laterally adjacent to each other by one or more dielectric layers.
10. The semiconductor topography of claim 5 , wherein the ferromagnetic layer spans the entirety of the semiconductor topography with exception to the region comprising the bond pad.
11. The semiconductor topography of claim 10 , wherein the region extends a remote distance around the periphery of the bond pad.
12. The semiconductor topography of claim 10 , wherein the semiconductor topography comprises a wafer.
13. The semiconductor topography of claim 10 , wherein the semiconductor topography comprises a die.
14. The semiconductor topography of claim 5 , wherein the ferromagnetic layer comprises a discrete segment arranged in alignment with one of the easy and hard axes of the magnetoresistive memory cell.