Experimental study demonstrates suppressed magnon radiation loss and reduced threshold current in Ni81Fe19/Pt nanostructures, indicating improved efficiency for spin torque nano-oscillators.
Spin torque nano-oscillators realized by magnetization dynamics trapped in a current-induced potential are reported. We fabricated Ni₈₁Fe₁₉/Pt nanostructures and measured current-induced microwave emission from the structures. The result shows an increase in the magnitude and spectral narrowing of the microwave emission. We demonstrate that the current-induced magnetic field suppresses magnon radiation loss and significantly reduces the linewidth and the threshold current required for the spin torque oscillation.
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Makiuchi et al. (2024) studied this question.
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