Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions

Details Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions

2009-04-06

arxiv.org/abs/0904.0880v2

Physics

Condensed Matter

Materials Science

12 pages, 3 figures, published in Phys. Rev. B 80, 060404 (2009)

Scientific paper

We demonstrate the strong impact of the oscillator agility on the line broadening by studying spin transfer induced microwave emission in MgO-based tunnel junctions with current. The linewidth is almost not affected by decreasing the temperature. At very low currents, a strong enhancement of the linewidth at low temperature is attributed to an increase of the non linearity, probably due to the field-like torque. Finally we evidence that the noise is not dominated by thermal fluctuations but rather by the chaotization of the magnetization system induced by the spin transfer torque.

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