Spin wave excitations in low dimensional systems with large magnetic anisotropy
Spin wave excitations in low dimensional systems with large magnetic anisotropy
Abstract The low-energy excitation spectrum of a two-dimensional ferromagnetic material is dominated by single-magnon excitations that show a gapless parabolic dispersion relation with the spin wave vector. This occurs as long as magnetic anisotropy and anisotropic exchange are negligible compared to isotropic exchange. However, to maintain magnetic order at finite …