Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells
J. Jaroszynski, T. Andrearczyk, G. Karczewski, J. Wrobel, T. Wojtowicz, E. Papis, E. Kaminska, A. Piotrowska, Dragana Popovic, T. Dietl
Abstract
We report on the observation of the Ising quantum Hall ferromagnet with Curie temperature TC 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 TC corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.
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