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

Abreu Araujo, F.; Piraux, L.; Antohe, V. A.; Cros, V.; Gence, L.
June 2013
Applied Physics Letters;6/3/2013, Vol. 102 Issue 22, p222402
Academic Journal
A combined bottom-up assembly of electrodeposited nanowires and electron beam lithography technique has been developed to investigate the spin transfer torque and microwave emission on specially designed nanowires containing a single Co/Cu/Co pseudo spin valve. Microwave signals have been obtained even at zero magnetic field. Interestingly, high frequency vs. magnetic field tunability was demonstrated, in the range 0.4-2 MHz/Oe, depending on the orientation of the applied magnetic field relative to the magnetic layers of the pseudo spin valve. The frequency values and the emitted signal frequency as a function of the external magnetic field are in good quantitative agreement with the analytical vortex model as well as with micromagnetic simulations.


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