  Current induced magnetization dynamics in asymmetric Cu/Co/Cu single magnetic
layer nanopillars has been studied experimentally at room temperature and in
low magnetic fields applied perpendicular to the thin film plane. In sub-100 nm
junctions produced using a nanostencil process a bistable state with two
distinct resistance values is observed. Current sweeps at fixed applied fields
reveal hysteretic and abrupt transitions between these two resistance states.
The current induced resistance change is 0.5%, a factor of 5 greater than the
anisotropic magnetoresistance (AMR) effect. We present an experimentally
obtained low field phase diagram of current induced magnetization dynamics in
single ferromagnetic layer pillar junctions.
