Magnetic anisotropy results from dilute

The results of the evaluation of dx"ldH for different values of in a dilute magnetic fluid are reported in Figure F.7.3. For small values (Fig. F.7.3f) the effects of anisotropy are averaged to zero by thermal fluctuations, and it results in a Lorentzian line with = w/y, characteristic of an isotropic superparamagnet. For high values (Fig. F.7.3a) the orientational distribution of easy axes yields an asymmetric line shifted from g = 2. The two components coexist for intermediate values. 

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