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Geil Emdi on Muck Rack

Geil Emdi

As seen in: Physical Review B
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Articles

Tunable sigmoid behavior of a magnon-based parametron using a ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}/\mathrm{Pt}$ bilayer disk

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By Geil Emdi, Tomosato Hioki, Takahiko Makiuchi, Eiji Saitoh
| Physical Review B
Abstract Sigmoidal curve behavior of 0 and π state probability in a magnon parametron, using yttrium iron garnet (Y3Fe5O12) thin disk, is systematically investigated. We demonstrate that the probability distribution can be tuned by bias and pump microwave power. Our numerical calculation that considers increasing damping due to four-magnon scattering processes reproduces the results well.
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Electrical detection of parallel parametric amplification and attenuation in a ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}/\mathrm{Pt}$ bilayer disk

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By Tomosato Hioki, Eiji Saitoh, Geil Emdi, Koujiro Hoshi
| Physical Review B
We report a systematic quantitative evaluation of parametric amplification gain of magnetization dynamics in an yttrium iron garnet (Y3Fe5O12) thin disk via ac spin pumping and the inverse spin Hall effect. We demonstrate its signature phase dependence where amplification and attenuation occur every π2 phase shift of the input signal. The results also show the pump-power dependence of the gain that is explained well by our theoretical model.
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