We study finite temperature ( T) properties of the continuum quantum field theory of systems with a ferromagnetic ground state. A scaling theory of the T0ex0ex=0ex0ex0 system is discussed carefully, and its consequences for crossovers between different finite T regimes in dimensions 1, 2, and 3 are described. The results are compared with recent NMR measurements of the magnetization of a quantum Hall system with filling factor ν0ex0ex=0ex0ex1; we predict that the relaxation rate 1/T₁ of this system may have a finite T ``ferromagnetic coherence peak.''
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Read et al. (1995) studied this question.
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