Critical behavior of magnetic losses in nickel near the Curie temperature: Separation of magnetic losses by analyzing linear and nonlinear susceptibilities

A new method is proposed to separate magnetic losses near the Curie temperature T-C by analyzing both the ac linear (X-0) and nonlinear (X-2) susceptibilities on the basis of the Rayleigh law. This method is applied to X-0 and X-2 of nickel to obtain the temperature dependence of the Rayleigh constant and the linear and the nonlinear terms of the residual loss near T-C. The Rayleigh constant diverges approaching T-C from below. The residual-loss terms show sharp peaks at T-C. Analysis of the critical behavior yields the values of the critical exponents for the Rayleigh constant and the residual-loss terms.