2013/08/31 by L Rózsa, L. Rózsa, L Udvardi +3 · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/25/50/506002
published as J. Phys.: Condens. Matter 25 (2013) 506002 · 32 pages, 13 figures
arxiv created 2013/11/29 · arxiv updated 2013/12/02
A spin model including magnetic anisotropy terms and Dzyaloshinsky-Moriya interactions is studied for the case of a ferromagnetic monolayer with C2v symmetry like Fe/W(110). Using the quasiclassical stochastic Landau-Lifshitz-Gilbert equations, the magnon spectrum of the system is derived using linear response theory. The Dzyaloshinsky-Moriya interaction leads to asymmetry in the spectrum, while the anisotropy terms induce a gap. It is shown that in the presence of lattice defects, both the Dzyaloshinsky-Moriya interactions and the two-site anisotropy lead to a softening of the magnon energies. Two methods are developed to investigate the magnon spectrum at finite temperatures. The theoretical results are compared to atomistic spin dynamics simulations and a good agreement is found between them.