Ballistic magnetoresistance in atomic and nanometer size contacts

In this talk we will report the latest results in experimental and theory, obtained for ballistic magnetoresistance (BMR) in atomic and nanometer size contacts between Ni, CrO/sub 2/, Fe/sub 3/O/sub 4/ and permalloy electrodes. These contacts have been built between wires or thin films by mechanical contact or by electrodeposition.