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Photoinduced magnetization dynamics is investigated in chemically ordered$(\mathrm{LaMnO}_3)_{2n}/(\mathrm{SrMnO}_3)_n$ superlattices using thetime-resolved magneto-optic Kerr effect. A monotonic frequency-field dependenceis observed for the $n=1$ superlattice, indicating a single spin populationconsistent with a homogeneous hole distribution. In contrast, for $n\geq2$superlattices, a large precession frequency is observed at low fieldsindicating the presence of an exchange torque in the dynamic regime. We proposea model that ascribes the emergence of exchange torque to the coupling betweentwo spin populations -- viscous and fast spins.

Viscous spin exchange torque on precessional magnetization in $(\mathrm{LaMnO}_3)_{2n}/(\mathrm{SrMnO}_3)_{n}$ superlattices