Hysteresis of quantum uniaxial superparamagnets

Nonlinear ac stationary response and dynamic magnetic hysteresis of quantum uniaxial superparamagnets.

Yuri P. Kalmykov, Serguey V. Titov, and William T. Coffey

Phys. Rev. B 92, 174414 (2015)

DMH loops [m(t)=⟨SˆZ⟩(t)/S vs h(t)=cosωt] for various anisotropy parameters σ=10 (a), 15 (b), 20 (c), and various spin numbers S=3/2 (1: short-dashed lines), 4 (2: solid lines), 10 (3: dashed-dotted lines), 20 (4: dashed lines), and ∞ (asterisks) at ωτN=10−4, ξ0=0, and ξ=9.