Improved Spin Dynamics Simulations of Magnetic Excitations

TL;DR

This paper introduces advanced Suzuki-Trotter based algorithms for classical spin system simulations that conserve key physical quantities and allow larger time steps, potentially speeding up spin dynamics computations.

Contribution

The authors develop high-order Suzuki-Trotter algorithms that improve numerical integration efficiency and accuracy in classical spin dynamics simulations.

Findings

Algorithms conserve spin length exactly.

Higher-order schemes allow larger time steps.

Potential for significant speedup in simulations.

Abstract

Using Suzuki-Trotter decompositions of exponential operators we describe new algorithms for the numerical integration of the equations of motion for classical spin systems. These techniques conserve spin length exactly and, in special cases, also conserve the energy and maintain time reversibility. We investigate integration schemes of up to eighth order and show that these new algorithms can be used with much larger time steps than a well established predictor-corrector method. These methods may lead to a substantial speedup of spin dynamics simulations, however, the choice of which order method to use is not always straightforward.