Transverse Susceptibility of Single-domain Particle Systems

Simulations of the Transverse Susceptibility (TS) signal for single-domain and for systems of ferromagnetic particles are presented. When calculating the TS for single domains, details are provided concerning the uniaxial and cubic anisotropies. For the uniaxial single-domain particles a 2D critical approach can be used. The TS for cubic anisotropy is essentially a 3D problem that was solved with a micromagnetic Landau-Lifsith-Gilbert algorithm. Since the TS experimental method is extensively used in the laboratories for the anisotropy evaluation, the importance of this study consists in the fact that it offers a tool for understanding the problems and errors in the correct interpretation of the TS curves.