Abstract
Using the inelastic light scattering technique we observe the spin excitations for a quantum Hall ferromagnet with charged defects. The lowest energy spin excitation branch behaves as the theoretically predicted collective spin precession (``cyclotron'') mode of the spin-texture liquid. A coupling between the spin-exciton and the ``cyclotron'' mode indicates that the existing theory of noninteracting spin texture liquid does not provide a fully adequate description for the ground state of a quantum Hall ferromagnet with charged defects.
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