Magnetoelectric Spin Wave Amplifier for Spin Wave Logic Circuits

TL;DR

This paper introduces a magnetoelectric spin wave amplifier using a multiferroic structure to significantly boost spin wave amplitude while maintaining phase, promising advancements for spin wave logic circuits.

Contribution

It proposes a novel two-layer multiferroic amplifier design that enhances spin wave signals via electric field-induced stress and anisotropy control.

Findings

Spin wave amplitude can be increased by several orders of magnitude.

The amplifier preserves the phase of the original spin wave signal.

Numerical simulations confirm effective amplification and energy efficiency.

Abstract

We propose and analyze a spin wave amplifier aimed to enhance the amplitude of the propagating spin wave via the magnetoelectric effect. The amplifier is a two-layer multiferroic structure, which comprises piezoelectric and ferromagnetic materials. By applying electric field to the piezoelectric layer, the stress is produced. In turn, the stress changes the direction of the easy axis in the ferromagnetic layer and the direction of the anisotropy field. The rotation frequency of the easy axis is the same as the frequency of the spin wave propagating through the ferromagnetic layer. As a result of this two-stage process, the amplitude of the spin wave can be amplified depending on the angle of the easy axis rotation. We present results of numerical simulations illustrating the operation of the proposed amplifier. According to numerical estimates, the amplitude of the spin wave signal can be increased by several orders of magnitude. The energy efficiency of the electric-to-magnetic power conversion is discussed. The proposed amplifier preserves the phase of the initial signal, which is important for application to logic circuits based on spin waves.