Chiral magnetic domain walls under transverse fields: A semi-analytical model
Source abstract
Abstract
An analytical model for the domain wall structure in ultrathin films with perpendicular easy axis and interfacial Dzyaloshinskii-Moriya interaction, submitted to an arbitrary in-plane magnetic field, is presented. Its solution is simplified to the numerical minimization of an analytic function of just one variable. The model predictions are compared to numerical micromagnetic simulations, using parameters of existing samples, revealing a very good agreement. Remaining differences are analyzed, and partly corrected. Differences with the predictions of the simplest model, usually found in the literature, in which only the domain wall moment's in-plane orientation can vary, are exemplified. The model allows accurate computations, as a function of in-plane field module and orientation, of the domain wall tension and width, quantities controlling the creep motion of domain walls in such films.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Physics of Superconductivity and Magnetism · Magnetic Properties and Applications
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References (28)
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24. For the numerical simulations, three configurations had to be considered: (i) the minimized configuration with a domain wall in the center, (ii) the minimized configuration starting from the all-up state (as well as from the all-down one), (iii) the zero-thickness domain wall configuration, produced by pasting the left half of the all-up to the right half of the all-down minimized configurations. For configuration (iii), no evolution was performed and only the magnetostatic energy was evaluated. The domain wall energy was obtained as σ=LE(i)-E(ii)+Edem(ii)-Edem(iii), where L is the width of the central region (400 nm here) and E resp. Edem are total resp. magnetostatic average energy densities computed over that region. The last two terms in the equation allow removing the magnetostatic energy gained when demagnetizing a sample by having it split into two domains. The first difference is necessary because in MuMax3 a uniform configuration magnetized along the easy axis has a large (negative) energy. The domain wall energy is thus obtained by differences from large terms, so that accuracy of these terms is very important.
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