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We report on the observation of the Ising quantum Hall ferromagnet with Curietemperature $T_C$ as high as 2 K in a modulation-doped (Cd,Mn)Teheterostructure. In this system field-induced crossing of Landau levels occursdue to the giant spin-splitting effect. Magnetoresistance data, collected overa wide range of temperatures, magnetic fields, tilt angles, and electrondensities, are discussed taking into account both Coulomb electron-electroninteractions and s$-$d coupling to Mn spin fluctuations. The critical behaviorof the resistance ``spikes'' at $T \to T_C$ corroborates theoreticalsuggestions that the ferromagnet is destroyed by domain excitations.Comment: revised, 4 pages, 4 figure

Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells