Abstract
We consider a system of nonlinear autonomous differential equations that describe the orientation of the antiferromagnetic vector in a multiferroic film and find the conditions for the existence of spatially modulated structures of the cycloid type. We investigate the stability of such structures under spatial perturbations.
Similar content being viewed by others
References
Y. Tokura and S. Seki, “Multiferroics with spiral spin order,” Adv. Mater.22, 1554–1565 (2010).
N. A. Spaldin and R. Ramesh, “Advances in magnetoelectric multiferroics,” Nature Mater.18, 203–212 (2019).
I. Sosnowska, T. Neumaier, and E. Steichele, “Spiral magnetic ordering in bismuth ferrite,” J. Phys. C15, 4835–4846 (1982).
Yu. A. Izyumov, Neutron Diffraction in Long-Periodic Structures [in Russian], Energoatomizdat, Moscow (1987).
V. V. Nemytskii and V. V. Stepanov, Qualitative Theory of Differential Equations [in Russian], OGIZ, Moscow (1947); English transl., Princeton Univ. Press, Princeton, N. J. (1960).
C. Lanczos, The Variational Principles of Mechanics (Math. Expos., Vol. 4), Univ. of Toronto Press, Toronto (1952).
E. M. Galeev and V. M. Tikhomirov, Optimization: Theory, Examples, Problems [in Russian], Editorial URSS, Moscow (2000).
B. M. Levitan and V. V. Zhikov, Almost Periodic Functions and Differential Equations [in Russian], Moscow Univ. Press, Moscow (1978); English transl., Cambridge Univ. Press, London (1982).
N. I. Akhiezer, Lectures on Approximation Theory [in Russian], Nauka, Moscow (1965).
N. E. Kulagin, A. F. Popkov, and A. K. Zvezdin, “Spatially modulated antiferromagnetic structures in an easy-plane multiferroic,” Phys. Solid State53, 970–977 (2011).
N. E. Kulagin, A. F. Popkov, S. V. Solov’yov, and A. K. Zvezdin, Phys. Solid State, 61, 108–116 (2019).
M. V. Fedoryuk, Saddle-Point Method [in Russian], Nauka, Moscow (1977).
V. A. Yakubovich and V. M. Starzhinskii, Linear Differential Equations with Periodic Coefficients and Their Application [in Russian], Nauka, Moscow (1972)
V. A. Yakubovich and V. M. Starzhinskii, English transl.: Linear Differential Equations with Periodic Coefficients, John Wiley, New York (1975).
A. P. Shvartsman, “On the problem of boundedness of solutions of the differential equation y” + p(x)y = 0,” J. Appl. Math. Mech.18, 464–468 (1954).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare no conflicts of interest.
Additional information
Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 203, No. 1, pp. 26–39, April, 2020.
Rights and permissions
About this article
Cite this article
Kalyakin, L.A., Zvezdin, A.K. & Gareeva, Z.V. Asymptotic analysis of a multiferroic model. Theor Math Phys 203, 457–468 (2020). https://doi.org/10.1134/S0040577920040030
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0040577920040030