Abstract
We report on an approach to improving the performance of spin-torque nano-oscillators (STNOs) that utilizes power-dependent negative feedback to achieve significantly enhanced dynamic damping. In combination with a sufficiently slow variation of frequency with power, this can result in a quasilinear STNO, with weak nonlinear coupling of power and phase fluctuations over a range of bias currents and fields. An implementation of this approach that utilizes nonuniform spin torque applied to the oscillating magnetic free layer of a nanoscale spin-valve device demonstrates that highly coherent room-temperature STNOs can be achieved while retaining sufficient tunability.
Original language | English (US) |
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Article number | 224411 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 88 |
Issue number | 22 |
DOIs | |
State | Published - Dec 11 2013 |
Externally published | Yes |