Improved Spin Dynamics Simulations of Magnetic Excitations

Details Improved Spin Dynamics Simulations of Magnetic Excitations Improved Spin Dynamics Simulations of Magnetic Excitations

1999-12-20

arxiv.org/abs/cond-mat/9912373v1

Int. J. Mod. Phys. C 10, 1541-1551 (1999)

Physics

Condensed Matter

Statistical Mechanics

J. Mod. Phys. C (in press)

Scientific paper

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.

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