Patent ID: 6347049
Filing Date: 2002-02-12
Classification: B82Y,G01R,G11B,G11C,H01L

Abstract:
A magnetic tunnel junction device comprising:a first ferromagnetic layer and a second ferromagnetic layer, one of the ferromagnetic layers having its magnetic moment fixed in a preferred direction in the presence of an applied magnetic field in the range of interest and the other of the ferromagnetic layers having its magnetic moment free to rotate in the presence of the applied magnetic field in the range of interest; and a tunnel barrier layer located between the first and second ferromagnetic layers, the tunnel barrier layer comprising a first barrier layer of insulating material formed on and in contact with the first ferromagnetic layer and a second barrier layer of insulating material different from the material of the first barrier layer and located between the first barrier layer and the second ferromagnetic layer; and wherein the magnetic tunnel junction device has a resistance-area value less than approximately 1000 &OHgr;(&mgr;m)2.