2013/05/31 by Viacheslav A. Chizhikov, V. A. Chizhikov, Vladimir E. Dmitrienko +1 · 21 citations
Engineering · Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Ferromagnetism #Geometry #Helicity #Isotropy #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Mathematics #Multiferroics and related materials #Phenomenological model #Physics #Quantum mechanics #Spins #Twist #cond-mat.str-el
paper · pdf · doi:10.1016/j.jmmm.2015.01.032
published in Journal of Magnetism and Magnetic Materials 382, 142-151 (Elsevier BV) · 23 pages, 6 figures
arxiv created 2014/03/04 · openalex publication_date 2015/01/16 · arxiv updated 2015/02/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Twisted structures of chiral cubic ferromagnetics MnSi and Cu2OSeO3 can be described both in the frame of the phenomenological Ginzburg-Landau theory and using the microscopical Heisenberg formalism with a chirality brought in by the Dzyaloshinskii-Moriya (DM) interaction. Recent progress in quantum first-principal methods allows to calculate interatomic bond parameters of the Heisenberg model, namely, isotropic exchange constants Jij and DM vectors Dij, which can be used for simulations of observed magnetic textures and comparison of their calculated characteristics, such as magnetic helix sense and pitch, with the experimental data. In the present work, it is found that unaveraged microscopical details of the spin structures (the local canting) have a strong impact on the global twist and can notably change the helix propagation number. Coefficients \cal J and \cal D of the phenomenological theory and helix propagation number k=\cal D/2\cal J are derived from interatomic parameters Jij and Dij of individual bonds for MnSi and Cu2OSeO3 crystals and similar cubic magnetics with almost collinear spins.