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We observe a stable intermediate resistance switching state in the currentperpendicular to plane geometry for all Co/Cu/Co double layer nanopillarjunctions grown by molecular beam epitaxy. This novel state has a resistancebetween the resistances of the parallel and antiparallel alignment of bothCo-layer magnetizations. The state, which originates from an additionalin-plane magnetic easy axis, can be reached by spin transfer torque switchingor by an external magnetic field. In addition to spin torque-induced coherentsmall-angle spin wave modes we observe a broad microwave emission spectrum. Thelatter is attributed to incoherent magnetic excitations that lead to aswitching between the intermediate state and the parallel or antiparallelalignment of both ferromagnetic layers. We conclude that the additionalmagnetic easy axis suppresses a stable trajectory of coherent large-angleprecession, which is not observed in our samples.

Intermediate state switching dynamics in magnetic double layer nanopillars grown by molecular beam epitaxy