The present invention provides a magnetic tunnel junction device for an external magnetic field sensor. The device comprises a stack of multi-layers, which include a first antiferromagnetic pinning layer, a ferromagnetic free layer, a tunneling barrier layer, a ferromagnetic pinned layer, and a second...http://www.google.com.au/patents/US6341053?utm_source=gb-gplus-sharePatent US6341053 - Magnetic tunnel junction elements and their fabrication method
