Spin-Transfer-Torque Driven Vortex Dynamics in Electrodeposited Nanowire Spin-Valves
(2017) SPIN — Vol. 07, n° 01, p. 1740007 (2017)
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- Abstract
- A bottom-up approach for the fabrication of an assembly of electrodeposited nanowires has been combined to single nanowire electrical connection techniques to investigate the spin-transfertorque and microwave emission of specially designed nanowires containing Co/Cu/Co pseudo spin-valves (SVs). Porous alumina templates are used for the growth by electrodeposition of metallic in-series connected SVs. Under speci¯c magnetic ¯eld and injected current conditions, emission of microwave current is detected with frequency in the GHz range and linewidth as low as 1.8 MHz. Microwave signals have been obtained even at zero magnetic ¯eld and high frequency versus magnetic ¯eld tunability was demonstrated. Our ¯ndings are in good agreement with micromagnetic simulations. In addition, it appears that in our particular geometry, the microwave emission is generated by the vortex gyrotropic motion which occurs in, at least, one of the two magnetic layers of our SV structures.
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Abreu Araujo, F., & Piraux, L. (2017). Spin-Transfer-Torque Driven Vortex Dynamics in Electrodeposited Nanowire Spin-Valves. SPIN, 07(01), 1740007. https://doi.org/10.1142/S2010324717400070 (Original work published 2017)