Larmor Precession and Debye Relaxation of Single-Domain Magnetic Nanoparticles

Figure 1

(colour online) The characteristic change of the equilibrium magnetization within a periodic driving cycle as given by the Langevin function (ℒ, equation (10)) and Rosensweig’s chord susceptibility (𝑅, (12)) for different 𝐻₀ amplitude magnetizing field 𝐻(𝑡)=𝐻₀cos(2𝜋𝑡/𝑇). At low 𝐻₀ field amplitudes the two curves are identical (a). At increasing 𝐻₀ field amplitudes only the extrema remain identical.

(a)

(b)

(c)

(d)