Patent ID: 6518588
Filing Date: 2003-02-11
Classification: B82Y,H01L

Abstract:
A magnetic tunnel junction cell comprising:an electrically conductive underlayer comprising a first layer selected from the group consisting of a tantalum nitride and a tungsten nitride and a second layer selected from the group consisting of tantalum and tungsten located on and in contact with the first layer; a pinned ferromagnetic layer on the second layer of the underlayer; a free ferromagnetic layer having its magnetic moment free to rotate in the presence of an applied magnetic field; a tunnel barrier layer located between the pinned ferromagnetic layer and the free ferromagnetic layer; and an electrically conductive capping layer on the free ferromagnetic layer, the capping layer comprising a first layer selected from the group consisting of a tantalum nitride and a tungsten nitride and a second layer selected from the group consisting of tungsten and tantalum located on and in contact with the first layer, the first layer of the capping layer being located on and in contact with the free ferromagnetic layer.