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Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators
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Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators
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We present an experimental study of the power spectrum of current-driven magnetization oscillations in MgO tunnel junctions under low bias. We find the existence of narrow spectral lines, down to 8 MHz in width at a frequency of 10.7 GHz, for small applied fields with clear evidence of an auto-oscillation threshold. Micromagnetics simulations indicate that the excited mode corresponds to an edge mode of the synthetic antiferromagnet.
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