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A combined bottom-up assembly of electrodeposited nanowires and electron beamlithography technique has been developed to investigate the spin transfertorque and microwave emission on specially designed nanowires containing asingle Co/Cu/Co pseudo spin valve. Microwave signals have been obtained even atzero magnetic field. Interestingly, high frequency vs. magnetic fieldtunability was demonstrated, in the range 0.4 - 2 MHz/Oe, depending on theorientation of the applied magnetic field relative to the magnetic layers ofthe pseudo spin valve. The frequency values and the emitted signal frequency asa function of the external magnetic field are in good quantitative agreementwith the analytical vortex model as well as with micromagnetic simulations.

Single spin-torque vortex oscillator using combined bottom-up approach and e-beam lithography