  Manipulate and control of spin wave and spin flip are crucial for future
developments of magnonic and spintronic devices. We present that the spin wave
in hexagonal LuMnO3 single crystal can be selectively excited with laser
polarization perpendicular to the c-axis of hexagonal LuMnO3 and photon energy
~ 1.8 eV. The selective excitation of spin wave also suggests that the spin
flip can be selectively controlled in hexagonal manganites. In addition, the
physical origin of spin wave correlated with spin flip in hexagonal manganites
is discussed.
