Spin-Wave Resonance in One-Dimensional Magnonic Crystals by an Example of Multilayer Co-P Films

Layered magnetic films of Co-P alloy, which are sets of laminates with certain atomic and chemical structures, have been investigated by spin-wave resonance. Coatings of two types were synthesized: a magnonic crystal (amorphous Co(P)/fcc Co(P))(N) and gradient Co(P) films. They exhibit two different modifications of the spin-wave resonance (SWR) spectrum. In the first case, the SWR spectrum is described as H-n(n) similar to n(2)with a modification caused by the formation of the first stop band of the magnonic crystal. In the second case, the dependence of resonance fields H(n)of the spin-wave modes on mode numbernhas the form of H-n(n) similar to n(2/3). Thermal annealing leads to crystallization (amorphous alloy -> fcc) and causes transformation of the layered films to the films of single-phase Co-P alloys, which is accompanied by a change in the shapes of the SWR spectra and occurrence of a "exchange kink" spectral modification.