Patent ID: 8289757
Filing Date: 2012-10-16
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A method of manufacturing a magnetic random access memory (MRAM) cell comprising: forming a plurality of diffusion regions and a transistor gate, collectively defining an access transistor, in a silicon substrate; forming a first metal-interposed-in-interlayer dielectric (ILD) layer having a first metal dispersed therethrough on top of the access transistor, the first metal coupled to one of the plurality of diffusion regions and being in close proximity to a bit line; forming a plurality of ILD layers on top of the first ILD layer with each layer being formed on top of a previous layer; forming a magneto tunnel junction (MTJ) substantially on top of the plurality of ILD layers, each of the plurality of ILD layers having the metal dispersed therethrough; forming a MTJ mask on top of the MTJ for patterning the MTJ; etching the MTJ mask to expose the MTJ; forming a spacer on top of and around the exposed MTJ; depositing a second metal on top of the bit line and over a portion of the top most one of the plurality of ILD layers and extending over the top of the MTJ; forming an interconnect mask on top of the second metal defining an interconnect; depositing at least one passivation layer on top of the MTJ and the surface of the top most layer of the plurality of ILD layers and the bit line; masking and etching the at least one passivation layer; and removing the interconnect to expose the MTJ thereby forming an embedded magnetic random access memory (MRAM).