Abstract
Giant-magnetoresistance was used to measure the switching of patterned multilayer stacks either close to or removed from a ferromagnetic nanowire. Stray fields from the nanowire greatly changed the stack's free layer hysteresis characteristics. Four distinct switching modes were observed when the applied field opposed the pinned layer magnetization, but reproducible switching occurred otherwise. Micromagnetic modeling suggested that the asymmetry was due to interlayer stray field interactions and the Oersted field from the measuring current, while the switching modes were due to transverse components from the nanowire stray field. The results demonstrate the feasibility of remote electrical detection of nanowire magnetization.
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