Loss separation for dynamic hysteresis in magnetic thin films

Abstract

We develop a theory for dynamic hysteresis in ferromagnetic thin films, on the basis of the phenomenological principle of loss separation. We observe that, remarkably, the theory of loss separation, originally derived for bulk metallic materials, is applicable to disordered magnetic systems under fairly general conditions regardless of the particular damping mechanism. We confirm our theory both by numerical simulations of a driven random--field Ising model, and by re--examining several experimental data reported in the literature on dynamic hysteresis in thin films. All the experiments examined and the simulations find a natural interpretation in terms of loss separation. The power losses dependence on the driving field rate predicted by our theory fits satisfactorily all the data in the entire frequency range, thus reconciling the apparent lack of universality observed in different materials.

4 pages, 6 figures

References in corpus (7)

• Hysteresis and hierarchies: dynamics of disorder-driven first-order phase transformations
• Dynamic transitions and hysteresis
• Hysteresis, Avalanches, and Disorder Induced Critical Scaling: A Renormalization Group Approach
• Disorder-Induced Critical Phenomena in Hysteresis: Numerical Scaling in Three and Higher Dimensions
• Driving rate effects in avalanche-mediated, first-order phase transitions
• Theory of Hysteresis Loop in Ferromagnets
• Dynamic hysteresis in Finemet thin films

Cited by in corpus (7)

• Hysteresis and noise in ferromagnetic materials with parallel domain walls
• Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets
• Relaxation-to-creep transition of domain-wall motion in two- dimensional random-field Ising model with ac driving field
• Large-scale Monte Carlo simulations for the depinning transition in Ising-type lattice models
• Hysteresis in the T=0 RFIM: beyond metastable dynamics
• Nonsteady dynamic properties of a domain wall for the creep state under an alternating driving field
• Coercivity Landscape Characterizes Dynamic Hysteresis