  The copper fluoride $Cu_2F_5$ is a proposed stable compound that can be seen
as a layered lattice of $S=1$ and $S=1/2$ sites, corresponding to copper ions.
Intending to cast light on the transport properties of ferrimagnetic magnons,
we use the linear spin wave approach to study the magnon band structure of the
2D lattice in a ferrimagnetic off-plane order, as well as the transverse
transport of magnons in the crystal bulk. A magnetic field or temperature
gradient can induce transverse (Hall-like) transport within the linear response
theory generated by the Berry curvature of the eigenstates. As in most cases
involving magnons, the Berry curvature is related to Dzyaloshinskii-Moriya
interactions between next-near-neighbors. The band structure of the system is
non-degenerate and the transport coefficients are non-null. The novel and
interesting feature of the system is that, within certain conditions, the
transport coefficients versus temperature curves are non-monotonic and present
a sign change, opening the exciting possibility of controlling the transverse
magnon flow direction and magnitude with the temperature change.
