The information carrier of modern technologies is the electron charge whose
transport inevitably generates Joule heating. Spin-waves, the collective
precessional motion of electron spins, do not involve moving charges and thus
avoid Joule heating. In this respect, magnonic devices in which the information
is carried by spin-waves attract interest for low-power computing. However
implementation of magnonic devices for practical use suffers from low spin-wave
signal and on/off ratio. Here we demonstrate that cubic anisotropic materials
can enhance spin-wave signals by improving spin-wave amplitude as well as group
velocity and attenuation length. Furthermore, cubic anisotropic material shows
an enhanced on/off ratio through a laterally localized edge mode, which closely
mimics the gate-controlled conducting channel in traditional field-effect
transistors. These attractive features of cubic anisotropic materials will
invigorate magnonics research towards wave-based functional devices
