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The temperature dependence of a vortex-based nano-oscillator induced by spintransfer torque (STVO) in magnetic tunnel junctions (MTJ) is considered. Weobtain emitted signals with large output power and good signal coherence. Dueto the reduced non-linearities compared to the uniform magnetization case, wefirst observe a linear decrease of linewidth with decreasing temperature.However, this expected behavior no longer applies at lower temperature and abottom limit of the linewidth is measured.

Temperature dependence of microwave voltage emission associated to spin-transfer induced vortex oscillation in magnetic tunnel junction