  A sensitive tunnel diode oscillator (TDO) operating at 4MHz is used to probe
the dynamic response of La_{1-x}Sr_{x}MnO_{3} single crystals for
x=0.125,0.175,0.28 and 0.33 doping. Systematics of the measured change in
reactance as a function of temperature (30K<T<320K) and DC magnetic field
(0<H<6kOe) reveal distinct temperature and field scales associated with the
dynamic response of spin. It is notable that these features are far more
striking than the corresponding features in static measurements. The results
are discussed in the context of structural changes leading to polaron ordering.
