  Molecular beam epitaxy is used to fabricate magnetic single and double layer
junctions which are deposited in prefabricated nanostencil masks. For all Co |
Cu | Co double layer junctions we observe a stable intermediate resistance
state which can be reached by current starting from the parallel configuration
of the respective ferromagnetic layers. The generation of spin waves is
investigated at room temperature in the frequency domain by spectrum analysis,
demonstrating both in-plane and out-of-plane precessions of the magnetization
of the free magnetic layer. Current-induced magnetization dynamics in magnetic
single layer junctions of Cu | Co | Cu has been investigated in magnetic fields
which are applied perpendicular to the magnetic layer. We find a hysteretic
switching in the current sweeps with resistance changes significantly larger
than the anisotropic magnetoresistance effect.
