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Tunable Magnetic Vortex Dynamics in Ion-Implanted Permalloy Disks
journal contribution
posted on 2020-06-04, 22:04 authored by Lakshmi Ramasubramanian, Attila Kákay, Ciarán Fowley, Oguz Yildirim, Patrick Matthes, Serhii Sorokin, Aleksandra Titova, Donovan Hilliard, Roman Böttger, René Hübner, Sibylle Gemming, Stefan E. Schulz, Florian Kronast, Denys Makarov, Jürgen Fassbender, Alina DeacNanoscale,
low-phase-noise, tunable transmitter–receiver
links are key for enabling the progress of wireless communication.
We demonstrate that vortex-based spin-torque nano-oscillators, which
are intrinsically low-noise devices because of their topologically
protected magnetic structure, can achieve frequency tunability when
submitted to local ion implantation. In the experiments presented
here, the gyrotropic mode is excited with spin-polarized alternating
currents and anisotropic magnetoresistance measurements yield discrete
frequencies from a single device. Indeed, chromium-implanted regions
of permalloy disks exhibit different saturation magnetization than
neighboring, non-irradiated areas, and thus different resonance frequency,
corresponding to the specific area where the core is gyrating. Our
study proves that such devices can be fabricated without the need
for further lithographical steps, suggesting ion irradiation can be
a viable and cost-effective fabrication method for densely packed
networks of oscillators.
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low-noise devicesVortex Dynamicslithographical stepssaturation magnetizationanisotropic magnetoresistance measurementsfrequency tunabilitygyrotropic modechromium-implanted regionsion implantationpermalloy disks exhibitIon-Implanted Permalloy Disks Nanoscaleresonance frequencyfabrication methodnon-irradiated areasion irradiationvortex-based spin-torque nano-oscillators
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