Spin dynamics simulations on Surface for a nanoscale Heisenberg antiferromagnet

Monte Carlo and spin dynamics techniques with fourth-order
Suzuki-Trotter decompositions of the exponential operator have been
used to perform large-scale simulations of the dynamic behavior of a
nanoscale, classical, Heisenberg antiferromagnet on a simple-cubic lat-
tice at a temperature below the Néel temperature 1. A classical isotropic
Heisenberg model with an antiferromagnetic nearest-neighbor exchange
interaction was studied. A simple-cubic lattices with free boundary con-
ditions was used. The assumption of q-space spin-wave reflections with
broken momentum conservation due to free-surface confinements was
developed and used to explain multiple excitation peaks for wave vec-
tors within the first Brillouin zone appear in the spin-wave spectra of
the transverse component of dynamic structure factor in the
nanoscale classical Heisenberg antiferromagnet. In this study, we applied
the same simulation techniques to the nanoscale classical Heisenberg an-
tiferromagnet we studied before for studying spin dynamic behavior on
the surfaces of a nanoscale antiferromagnet.

1 Z.Hou, D. P. Landau, G. M. Stocks, and G. Brown, Phys.Rev.B 91, 064417(2015)