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We propose and analyze a spin wave amplifier aimed to enhance the amplitudeof the propagating spin wave via the magnetoelectric effect. The amplifier is atwo-layer multiferroic structure, which comprises piezoelectric andferromagnetic materials. By applying electric field to the piezoelectric layer,the stress is produced. In turn, the stress changes the direction of the easyaxis in the ferromagnetic layer and the direction of the anisotropy field. Therotation frequency of the easy axis is the same as the frequency of the spinwave propagating through the ferromagnetic layer. As a result of this two-stageprocess, the amplitude of the spin wave can be amplified depending on the angleof the easy axis rotation. We present results of numerical simulationsillustrating the operation of the proposed amplifier. According to numericalestimates, the amplitude of the spin wave signal can be increased by severalorders of magnitude. The energy efficiency of the electric-to-magnetic powerconversion is discussed. The proposed amplifier preserves the phase of theinitial signal, which is important for application to logic circuits based onspin waves.

Magnetoelectric Spin Wave Amplifier for Spin Wave Logic Circuits