It is demonstrated by analytical calculations and micromagnetic simulations that a microwave pumping by means of a voltage-controlled magnetic anisotropy (VCMA) could excite propagating spin waves in a ferromagnetic nanowire with in-plane static magnetization, and only the parametric excitation is possible. The efficiency of the parametric excitation is proportional to the out-of-plane component of the dynamic magnetization, and it is nonvanishing in the entire range of spin-wave wave vectors. This property ensures the excitation of spin waves in a wide frequency range (up to tens of gigahertz) using practically achievable amplitudes of the VCMA pumping. For a Fe/MgO nanowire, the threshold of parametric excitation of spin waves lies in the range 0.5-1 V/nm and only weakly depends on the nanowire width.
Excitation of Spin Waves in an In-Plane-Magnetized Ferromagnetic Nanowire Using Voltage-Controlled Magnetic Anisotropy
Carpentieri, MarioSecondo
;Finocchio, Giovanni;
2017-01-01
Abstract
It is demonstrated by analytical calculations and micromagnetic simulations that a microwave pumping by means of a voltage-controlled magnetic anisotropy (VCMA) could excite propagating spin waves in a ferromagnetic nanowire with in-plane static magnetization, and only the parametric excitation is possible. The efficiency of the parametric excitation is proportional to the out-of-plane component of the dynamic magnetization, and it is nonvanishing in the entire range of spin-wave wave vectors. This property ensures the excitation of spin waves in a wide frequency range (up to tens of gigahertz) using practically achievable amplitudes of the VCMA pumping. For a Fe/MgO nanowire, the threshold of parametric excitation of spin waves lies in the range 0.5-1 V/nm and only weakly depends on the nanowire width.File | Dimensione | Formato | |
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Verba (PRA 2017) - Excitation of Spin Waves in an In-Plane-Magnetized Ferromagnetic Nanowire Using Voltage-Controlled Magnetic Anisotropy.pdf
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