Single spin-torque vortex oscillator using combined bottom-up approach and e-beam lithography
arXiv:1301.3431 · doi:10.1063/1.4808451
Abstract
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.
9 pages, 4 figures
References in corpus (7)
- Current-driven vortex oscillations in metallic nanocontacts
- Spin-Torque Driven Magnetization Dynamics: Micromagnetic Modelling
- Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
- Impact of the electrical connection of N Spin Transfer Oscillators on their synchronization : an analytical study
- Phase locking of vortex based spin transfer oscillators to a microwave current
- Template nanowires for spintronics applications: nanomagnet microwave resonators functioning in zero applied magnetic field
- Probing Magnetic Configurations in Co/Cu Multilayered Nanowires