Spin-wave propagation in cubic anisotropy materials.

We experimentally demonstrate that the spin-wave propagation in the hard-axis direction of an epitaxial Fe waveguide with a cubic anisotropy shows an enhanced spin-wave signal by improving spin-wave amplitude as well as group velocity and attenuation length. Schematic illustrations of a, easy-easy case (both directions of the magnetization and spin-wave propagation are in the easy axis) and b, hard-hard case (both directions of the magnetization and spin-wave propagation are in the hard axis). Magnetic-field dependences of spin-wave amplitude for c, easy-easy case and d, hard-hard case. e, Spin-wave attenuation length and f, group velocity as a function of the magnetic field.