Patent ID: 6703654
Filing Date: 2004-03-09
Classification: B82Y,H01L

Abstract:
A magnetic tunneling junction (MTJ) device having a smooth bottom conductor electrode of low sheet resistance comprising:a substrate having a substantially planar upper surface; a bottom conductor electrode layer formed on said substrate, said bottom conductor electrode layer formed of substantially planar layers and further comprising: a crystalline growth enhancing seed layer formed on said substrate; a non-magnetic high melting point metal layer formed on said seed layer, said metal having its crystal plane aligned by said seed layer parallel to the plane of said metal layer; an overlayer formed on said metal layer, said overlayer providing crystal alignment for subsequently formed layers and said seed layer and said overlayer providing enhanced specular reflection of electrons within said metal layer, thereby reducing the sheet resistance of said bottom electrode layer; a substantially planar MTJ layer formed on said bottom conductor lectrode layer; a capping layer formed on said MTJ layer.