Patent ID: 7042032

Claim:
A tunneling magnetoresistive magnetic data storage product with improved electrical isolation and storage density comprising: a substrate; a magnetic data storage device formed over the substrate, the magnetic data storage device comprising a free magnetoresistive material layer separated from a pinned magnetoresistive material layer by a dielectric spacer material layer, the pinned magnetoresistive material layer comprising a magnetoresistive material layer and an adjacent anti-ferromagnetic layer, the magnetic data storage device comprising at least a first stack of layers overlying the substrate; wherein a single self aligned sidewall spacer is disposed annularly surrounding the sidewalls of the first stack of layers, the first stack of layers further comprising an uppermost conductive layer for carrying a current and layers underlying the uppermost conductive layer selected from the group consisting of: the free magnetoresistive material layer, and the pinned magnetoresistive material layer, and the dielectric spacer material layer; and, wherein underlying layers not selected from the group to form the first stack of layers, if any, comprise a second stack of layers, the second stack of layers disposed underlying the first stack of layers, the second stack of layers having exposed sidewalls, and the second stack of layers having a larger width than the first stack of layers.