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arXiv · 1912.09392

Tuning Ginzburg-Landau theory to quantitatively study thin ferromagnetic materials

Pamela C. Guruciaga·Nirvana Caballero·Vincent Jeudy·Javier Curiale·Sebastian Bustingorry
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Abstract

Along with experiments, numerical simulations are key to gaining insight into the underlying mechanisms governing domain wall motion in thin ferromagnetic systems. However, a direct comparison between numerical simulation of model systems and experimental results still represents a great challenge. Here, we present a tuned Ginzburg-Landau model to quantitatively study the dynamics of domain walls in quasi two-dimensional ferromagnetic systems with perpendicular magnetic anisotropy. This model incorporates material and experimental parameters and the micromagnetic prescription for thermal fluctuations, allowing us to perform material-specific simulations and at the same time recover universal features. We show that our model quantitatively reproduces previous experimental velocity-field data in the archetypal perpendicular magnetic anisotropy Pt/Co/Pt ultra-thin films in the three dynamical regimes of domain wall motion (creep, depinning and flow). In addition, we present a statistical analysis of the domain wall width parameter, showing that our model can provide detailed nano-scale information while retaining the complex behavior of a statistical disordered model.

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Pamela C. Guruciaga, Nirvana Caballero, Vincent Jeudy, Javier Curiale, Sebastian Bustingorry. 2019-12-19. Tuning Ginzburg-Landau theory to quantitatively study thin ferromagnetic materials. https://doi.org/10.1088/1742-5468/abe40a

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