  We experimentally demonstrate magnetostatic coupling between a nanopillar
pseudo spin valve structure and a linear array of dipole coupled Permalloy
nanomagnets. Using magnetic force microscopy, we study the interaction between
the spin valve and the first element of the array, and present evidence that
the nanomagnet couples with the hard layer of the spin valve for two spin
valves with distinctly different composition. Our study includes a statistical
analysis of antiferromagnetic order within the linear array, and provides
insight into the range of behavior that these arrays can display. These results
bear directly on the design of magnetic quantum cellular automata (MQCA) logic
devices, showing that multilayer devices can couple to simple nanomagnets.
Redesigning the hard layer of the magnetoresistive devices would make them
operational as an electronic input that will allow integration of MQCA networks
in complex electronic circuitry.
