Relativistic and thermal effects on the magnon spectrum of a ferromagnetic monolayer

Abstract

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.

32 pages, 13 figures

References in corpus (3)

• Asymmetric Spin-wave Dispersion on Fe(110): Direct Evidence of Dzyaloshinskii--Moriya Interaction
• Spin Orbit Coupling and Spin Waves in Ultrathin Ferromagnets: The Spin Wave Rashba Effect
• Highly Dispersive Scattering From Defects In Non-Collinear Magnets

Cited by in corpus (9)

• Formation of magnetic skyrmions with tunable properties in PdFe bilayer deposited on Ir(111)
• Temperature scaling of the Dzyaloshinsky-Moriya interaction in the spin wave spectrum
• Thermally driven domain wall motion in Fe on W(1 1 0)
• Inertial spin waves in ferromagnets and antiferromagnets
• Localized spin waves in isolated $k\pi$ skyrmions
• Magnetic correlations beyond the Heisenberg model in an Fe monolayer on Rh(001)
• Non-collinear Magnetic Configurations at Finite Temperature in Thin Films
• Engineering spin-wave spectrum via the magnetization inertia tensor
• Unquenched orbital angular momentum as the origin of spin inertia