  Here we propose a method of the excitation of perpendicular standing spin
waves (PSSWs) of different orders in an optomagnonic microcavity by ultrashort
laser pulses. The microcavity is formed by a magnetic dielectric film
surrounded by dielectric non-magnetic Bragg mirrors. Optical cavity modes in
the magnetic layer provide concentration and strongly non-uniform distribution
of the optical power over the layer thickness and therefore induce the
effective field of the inverse Faraday effect also spatially non-uniform. It
results in excitation of PSSWs. PSSWs whose wavevector is closest to the
wavevector characterizing distribution of the inverse Faraday effect field are
excited most efficiently. Consequently, a key advantage of this approach is a
selectivity of the PSSW excitation which allows to launch PSSWs of required
orders only. All-optical operation of the optomagnonic cavities opens new
possibilities for their applications for quantum technologies.
