Magnonic crystal theory of the spin-wave frequency gap in low-doped manganites.

Authors :: Krawczyk, M.
Puszkarski, H.
Source :: Journal of Applied Physics; 10/1/2006, Vol. 100 Issue 7, p073905, 5p, 1 Diagram, 3 Graphs
Publication Year :: 2006
Abstract: A theory of three-dimensional (3D) magnonic crystal (conceived as the magnetic counterpart of the photonic crystal) is developed and applied to explain the existence of the spin-wave frequency gap, recently revealed by neutron scattering experiments, in low-doped La<subscript>1-x</subscript>Ca<subscript>x</subscript>MnO<subscript>3</subscript> manganites. A confrontation of the theory with experimental results proves that certain manganites can be regarded as 3D magnonic crystals existing in the nanoscale in nature. [ABSTRACT FROM AUTHOR]