Title: Frequency shift keying in vortex-based spin torque oscillators
Authors: Manfrini, Mauricio ×
Devolder, Thibaut
Kim, Joo-Von
Crozat, Paul
Chappert, Claude
Van Roy, Wim
Lagae, Liesbet #
Issue Date: Apr-2011
Publisher: American Institute of Physics
Series Title: Journal of Applied Physics vol:109 issue:8 pages:-
Article number: 083940
Abstract: Vortex-based spin-torque oscillators can be made from extended spin valves connected to an electrical nanocontact. We study the implementation of frequency shift keying modulation in these oscillators. Upon a square modulation of the current in the 10 MHz range, the vortex frequency follows the current command, with easy identification of the two swapping frequencies in the spectral measurements. The frequency distribution of the output power can be accounted for by convolution transformations of the dc current vortex waveform, and the current modulation. Modeling indicates that the frequency transitions are phase coherent and last less than 25 ns. Complementing the multi-octave tunability and first-class agility, the capability of frequency shift keying modulation is an additional milestone for the implementation of vortex-based oscillators in radio frequency circuits. (C) 2011 American Institute of Physics. [doi:10.1063/1.3581099]
ISSN: 0021-8979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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