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arXiv · 2112.12308

Electric-field-induced parametric excitation of exchange magnons in a CoFeB/MgO junction

Angshuman Deka·Bivas Rana·Ryo Anami·Katsuya Miura·Hiromasa Takahashi·YoshiChika Otani·Yasuhiro Fukuma
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Abstract

Electric-field controlled magnetization dynamics is an important integrant in low power spintronic devices. In this letter, we demonstrate electric-field induced parametric excitation for CoFeB/MgO junctions by using interfacial in-plane magnetic anisotropy. When the in-plane magnetic anisotropy and the external magnetic field are parallel to each other, magnons are efficiently excited by using electric-field induced parametric excitation. Its wavelength and wavenumber are tuned by changing input power and frequency of the applied voltage. A generalized phenomenological model is developed to explain the underlying role of the electric-field torque. Electrical excitation with no Joule heating offers a good opportunity for developing magnonic devices and exploring various nonlinear dynamics in magnetic systems.

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Angshuman Deka, Bivas Rana, Ryo Anami, Katsuya Miura, Hiromasa Takahashi, YoshiChika Otani, Yasuhiro Fukuma. 2021-12-23. Electric-field-induced parametric excitation of exchange magnons in a CoFeB/MgO junction. https://arxiv.org/abs/2112.12308

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