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arXiv · 0908.0481

Time domain detection of pulsed spin torque damping reduction

Longfei Ye·Samir Garzon·Richard A. Webb·Mark Covington·Shehzaad Kaka·Thomas M. Crawford
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Abstract

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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Longfei Ye, Samir Garzon, Richard A. Webb, Mark Covington, Shehzaad Kaka, Thomas M. Crawford. 2009-08-04. Time domain detection of pulsed spin torque damping reduction. https://arxiv.org/abs/0908.0481

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