  We compare the characteristics of electrically transduced Damon-Eshbach
(DESWs) and backward volume (BVSWs) configurations within the same, 30 nm
thick, ferromagnetic, CoFeB waveguide. Sub-micron U-shaped antennas are used to
deliver the necessary in-plane and out-of-plane RF fields. We measure the
spin-wave transmission with respect to in-plane field orientation, frequency
and propagation distance. Unlike DESW, BVSWs are reciprocally transduced and
collected for either direction of propagation, but their ability to transport
energy is lower than DESWs for two reasons. This arises first because BVSW are
inductively transduced less efficiently than DESWs. Also, in the range of
wavevectors (~5 rad. um-1) typically excited by our antennas, the group
velocity of BVSWs stays lower than that of DESW, which leads to reduced
propagation ability that impact transmission signals in an exponential manner.
In contrast, the group velocity of DESWs is maximum at low fields and decreases
continuously with the applied field. The essential features of the measured SW
characteristics are well reciprocated by a simple, 1-D analytical model which
can be used to assess the potential of each configuration.
