Non-stationary magnetization dynamics driven by spin transfer torque

Details Non-stationary magnetization dynamics driven by spin transfer torque Non-stationary magnetization dynamics driven by spin transfer torque

2009-03-16

arxiv.org/abs/0903.2751v1

Physics

Condensed Matter

Other Condensed Matter

10 pages 4 figures, to be appear in Physical Review B

Scientific paper

10.1103/PhysRevB.79.104438

This paper shows that the presence of two dynamical regimes, characterized by different precessional-axis, is the origin of the non-monotonic behavior of the output integrated power for large-amplitude magnetization precession driven by spin-polarized current in nanoscale exchange biased spin-valves. In particular, at the transition current between those two regimes exists an abruptly loss in the integrated output power. After the introduction of a time-frequency analysis of magnetization dynamics based on the wavelet transform, we performed a numerical experiment by means of micromagnetic simulations. Our results predicted that, together with a modulation of the frequency of the main excited mode of the magnetization precession, at high non-linear dynamical regime the instantaneous output power of the spin-torque oscillator can disappear and then reappear at nanosecond scale.

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