Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Poster Session on Ferroic Domain Walls - Multiferroics (DF with KR/MA/TT)
MA 12.29: Poster
Monday, March 16, 2015, 19:00–21:00, Poster C
Ab initio expression of magneto-electric coupling coefficients in terms of current response function — •Ronald Starke1 and Giulio Schober2 — 1Institut f. Theo. Physik, Bergakademie Freiberg — 2Institut f. Theo. Physik, Uni Heidelberg
Based on the Functional Approach to electrodynamics of media, we show that the Maxwell equations imply closed, analytical expressions of the magneto-electric coupling coefficients in terms of the current response functions. On the linear level, these expressions include all effects of inhomogeneity, anisotropy and relativistic retardation. Moreover, we relate the 36 component functions of the constitutive tensor used in the context of bi-anisotropic media to only 9 causal response functions which specify the current response to an external vector potential.