Time domain detection of pulsed spin torque damping reduction

Details Time domain detection of pulsed spin torque damping reduction Time domain detection of pulsed spin torque damping reduction

2009-08-04

arxiv.org/abs/0908.0481v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

and suggestions are greatly appreciated (sgarzon at physics dot sc dot edu) 3.5 pages, 3 figures

Scientific paper

Combining multiple ultrafast spin torque impulses with a 5 nanosecond duration pulse for damping reduction, we observe time-domain precession which evolves from an initial 1 ns duration transient with changing precessional amplitude to constant amplitude oscillations persisting for over 2 ns. These results are consistent with relaxation of the transient trajectories to a stable orbit with nearly zero damping. We find that in order to observe complete damping cancellation and the transient behavior in a time domain sampling measurement, a short duration, fast rise-time pulse is required to cancel damping without significant trajectory dephasing.

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