Modeling Incoherent Strain Mediated Multiferroic Bennett Clocking

TL;DR

This paper presents a comprehensive nonlinear model combining spin dynamics and elastodynamics to better understand strain-mediated Bennett clocking in multiferroic systems, highlighting incoherent rotation effects.

Contribution

It introduces a fully coupled nonlinear model that captures full spin dynamics and magnetoelastic feedback, improving upon previous macrospin models.

Findings

Incoherent rotation can occur due to uniaxial magnetoelastic coupling.

The model applies to different materials like Ni and Terfenol-D.

Simulation results align with experimental observations.

Abstract

Strain mediated Bennett clocking has only recently been experimentally demonstrated and suffered from high error rates. Most models used to explain this behavior are macrospin models. Predictions of these models do not match experimental designs since they consider all spins rotating coherently and no magnetoelastic strain feedback. In this paper a fully coupled nonlinear model (LLG plus elastodynamics) was used to simulate voltage induced Bennett clocking. This modelling captures the full spin dynamics as well as shape anisotropy. Two materials were studied (Ni and Terfenol-D) which have very different exchange lengths. The simulation results show that incoherent rotation may occur due to the uniaxial nature of the magnetoelastic coupling.