Physics – Condensed Matter – Materials Science
Scientific paper
2010-09-08
Physics
Condensed Matter
Materials Science
6 pages, 5 figures
Scientific paper
10.1063/1.3581099
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 RF circuit.
Chappert Claude
Crozat P.
Devolder Thibaut
Kim Joo-Von
Lagae Liesbet
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