Linear dynamic susceptibilities third order

The equation for Qfv is derived in Section V.C together with the scheme of its solution down to the third order in From the solutions obtained, the terms yielding the linear and cubic low-frequency responses to the probing magnetic field H(t) = H cos cot are extracted. In terms of linear and cubic susceptibilities those quantities evaluated numerically are compared in Figures 4.31 and 4.32 primes and double primes there denote, as usual, the in-phase and out-of-phase components of the dynamic susceptibilities. 

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