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Viscous Spin Exchange Torque on Precessional Magnetization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>LaMnO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mrow><mml:mn>2</mml:mn><mml:mi>n</mml:mi></mml:mrow></mml:msub><mml:mo>/</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>SrMnO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">)</mml…
Photoinduced magnetization dynamics is investigated in chemically ordered $({\mathrm{LaMnO}}_{3}{)}_{2n}/({\mathrm{SrMnO}}_{3}{)}_{n}$ superlattices using the time-resolved magneto-optic Kerr effect. A monotonic frequency-field dependence is observed for the $n=1$ superlattice, indicating a single spin population consistent with a homogeneous hole distribution. In contrast, for $n\ensuremath{\ge}2$ superlattices, a large precession frequency is observed at low …