1306.4668 (O. J. Lee et al.)

A quasi-linear spin-torque nano-oscillator via enhanced negative
feedback of power fluctuations    [PDF]

O. J. Lee, P. M. Braganca, V. S. Pribiag, D. C. Ralph, R. A. Buhrman

We report an approach to improving the performance of spin torque nano-oscillators (STNOs) that utilizes power-dependent negative feedback to achieve a significantly enhanced dynamic damping. In combination with a sufficiently slow variation of frequency with power this can result in a quasi-linear STNO, with very weak non-linear coupling of power and phase fluctuations over a range of bias current and field. An implementation of this approach that utilizes a non-uniform spin-torque demonstrates that highly coherent room temperature STNOs can be achieved while retaining a significant tunability.

View original: http://arxiv.org/abs/1306.4668