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Equilibrium magnetization configurations in helical magnets

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2022, Tutor: Òscar Iglesias Clotas

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We have taken an in-depth study of curvature effects on the magnetism of low dimensional nanostructures.
We present a general theoretical framework based on a continuous approach to the micromagnetic relevant energy terms (exchange and anisotropy). The model shows that curvature induces effective anisotropy and Dzyaloshinskii-Moriya interactions that are not present in conventional cases. We have particularized the study to helical ferromagnetic helices, and found that they exhibit stable magnetization transitions between quasi-tangential to onion-like configurations. By performing atomistic Monte Carlo simulations, we have validated the theoretical framework and obtained a phase diagram of both phases. We have also performed MC simulations considering only dipolar interactions and found that abrupt magnetic ground state configuration transitions can be induced

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Equilibrium magnetization configurations in helical magnets