Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells

Abstract

We report on the observation of the Ising quantum Hall ferromagnet with Curie temperature $T_C$ as high as 2 K in a modulation-doped (Cd,Mn)Te heterostructure. In this system field-induced crossing of Landau levels occurs due to the giant spin-splitting effect. Magnetoresistance data, collected over a wide range of temperatures, magnetic fields, tilt angles, and electron densities, are discussed taking into account both Coulomb electron-electron interactions and s$-$d coupling to Mn spin fluctuations. The critical behavior of the resistance ``spikes'' at $T\to T_C$ corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.

revised, 4 pages, 4 figures

References in corpus (4)

• Resistance Spikes at Transitions between Quantum Hall Ferromagnets
• Resistance spikes and domain wall loops in Ising quantum Hall ferromagnets
• Landau Level Crossings and Extended-State Mapping in Magnetic Two-dimensional Electron Gases
• Spin textures, screening and excitations in dirty quantum Hall ferromagnets

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