Spin fluctuation renormalized theory

One problem with the Stoner-Wohlfarth theory is that most systems to which it has been applied exhibit a Curie-Weiss law for T > T. The Stoner-Wohlfarth theory is a molecular field theory and therefore includes neither spin correlations nor dynamics, nor is the detailed band structure taken into account explicitly. Several authors have recently turned their attention to this problem. Moriya and Takashashi (1978) used a renormalized theory of spin fluctuations (described in section 4.1.2) to obtain a Curie-Weiss law for x above T< for weak ferromagnets. They also showed that the critical indices are different, for example... 

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