Electrical Measurement of Spin-Wave Interactions of Closely-Spaced Spin Transfer Nano-Oscillators
Matthew R. Pufall, Billy F. Riddle, Stephen E. Russek, John Kakareka, Jordan A. Katine
We have investigated the interaction mechanism between two nanocontact spin transfer oscillators made on the same magnetic spin valve multilayer. The oscillators phase lock when their precession frequencies are made similar, and a giant magnetoresistance (GMR) signal is detectable at one contact due to precession at the other. We show that cutting the magnetic mesa between the contacts with a focused ion beam modifies the contact outputs, eliminates the mutual phase locking, and strongly attenuates the GMR coupling, indicating that spin-waves, rather than magnetic fields, are the primary interaction mechanism.