In this paper we study the asymptotic behavior of the solutions of time dependent micromagnetism problem in a multi-domain consisting of two joined ferromagnetic thin films. We distinguish different regimes depending on the limit of the ratio between the small thickness of the two films.
F.Alouges, T.Rivière and S.Serfaty, Néel and cross-tie wall energies for planar micromagnetic configurations. A tribute to J.L. Lions, ESAIM Control Optim. Calc. Var.8 (2002), 31–68.
2.
F.Alouges and A.Soyeur, On global weak solutions for Landau–Lifshitz equations: Existence and nonuniqueness, Nonlinear Anal.18(11) (1992), 1071–1084.
3.
H.Ammari, L.Halpern and K.Hamdache, Asymptotic behavior of thin ferromagnetic films, Asymptot. Anal.24 (2000), 277–294.
4.
H.Brezis, Functional Analysis, Sobolev Spaces and Partial Differential Equations, Universitext, Springer, New York, 2011.
5.
W.F.Brown, Micromagnetics, John Willey & Sons, New York, 1963.
6.
G.Carbou, Regularity of critical points of a non local energy, Calc. Var. Partial Differential Equations5 (1997), 409–433.
G.Carbou and F.Fabrie, Time average in micromagnetism, Journal of Differential Equations147 (1998), 383–409.
9.
G.Carbou and S.Labbè, Stabilization of walls for nano-wires of finite length, ESAIM Control Optim. Calc. Var.18(1) (2012), 1–21.
10.
G.Carbou, S.Labbè and E.Trèlat, Control of travelling walls in a ferromagnetic nanowire, Discrete Contin. Dyn. Syst. Ser. S1(1) (2008), 51–59.
11.
P.G.Ciarlet and P.Destuynder, A justification of the two-dimensional linear plate model, J. Mècanique18(2) (1979), 315–344.
12.
D.Cioranescu and P.Donato, An Introduction to Homogenization, Oxford Univ. Press, New York, 1999.
13.
E.De Giorgi and T.Franzoni, Su un tipo di convergenza variazionale, Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8)58(6) (1975), 842–850.
14.
U.De Maio, L.Faella and S.Soueid, Quasy-stationary ferromagnetic thin films in degenerated cases, Ricerche Mat.63 (2014), 225–237.
15.
A.Desimone, Energy minimizers for large ferromagnetic bodies, Arch. Rational Mech. Anal.125(2) (1993), 99–143.
16.
A.Desimone, Hysteresis and imperfection sensitivity in small ferromagnetic particles. Microstructure and phase transitions in solids, Meccanica30(5) (1995), 591–603.
17.
A.Desimone, R.V.Kohn, S.M.F.Alouges and S.Labbé, Convergence of a ferromagnetic film model, C. R. Math. Acad. Sci. Paris344(2) (2007), 77–82.
18.
A.Desimone, R.V.Kohn, S.Muller and F.Otto, A reduced theory for thin-film micromagnetics, Commun. Pure Appl. Math.55(11) (2002), 1408–1460.
19.
T.Durante, L.Faella and C.Perugia, Homogenization and behaviour of optimal controls for the wave equation in domains with oscillating boundary, Nonlinear Differ. Equ. Appl.14 (2007), 455–489.
20.
A.Gaudiello, B.Gustafsson, C.Lefter and J.Mossino, Asymptotic analysis for monotone quasilinear problems in thin multidomains, in: GAKUTO Internat. Ser. Math. Sci. Appl., Vol. 18, Gakkotosho, Tokyo, 2003, pp. 245–249.
21.
A.Gaudiello and R.Hadiji, Junction of one-dimensional minimization problems involving valued maps, Adv. Differ. Equ.13(9,10) (2008), 935–958.
22.
A.Gaudiello and R.Hadiji, Asymptotic analysis, in a thin multidomain, of minimizing maps with values in , Ann. Inst. Henri Poincaré, Anal. Non Linéaire26(1) (2009), 59–80.
23.
A.Gaudiello and R.Hadiji, Junction of ferromagnetic thin films, Calc. Var. Partial Differential Equations39(3) (2010), 593–619.
24.
A.Gaudiello and R.Hadiji, Ferromagnetic thin multi-structures, Journal of Differential Equations257 (2014), 1591–1622.
25.
A.Gaudiello and K.Hamdache, The polarization in a ferroelectric thin film: Local and nonlocal limit problems, ESAIM Control Optim. Calc. Var.19 (2013), 657–667.
26.
A.Gaudiello and A.Sili, Asymptotic analysis of the eigenvalues of an elliptic problem in an anisotropic thin multidomain, Proc. Roy. Soc. Edinburgh Sect. A141(4) (2011), 739–754.
27.
G.Gioia and R.D.James, Micromagnetism of very thin films, Proc. R. Lond. A453 (1997), 213–223.
28.
R.Hadiji and K.Shirakawa, Asymptotic analysis for micromagnetics of thin films governed by indefinite material coefficients, Commun. Pure Appl. Anal.9(5) (2010), 1345–1361.
29.
K.Hamdache and M.Tilioua, On the zero thickness limit of thin ferromagnetic films with surface anisotropy, Math. Models Appl. Sci.11(8) (2001), 1469–1490.
30.
R.Hardt and D.Kinderlehrer, Some regularity results in ferromagnetism, Communication in Partial Differential Equation25(7-8) (2000), 1235–1258.
31.
M.Hinze, R.Pinnau, M.Ulbrich and S.Ulbrich, Optimization with PDE Constraints, Mathematical Modelling: Theory and Applications, Vol. 23, Springer, New York, 2009.
32.
S.S.Irudayaraj and A.Emadi, Micromachines: Principles of operation, dynamics, and control, electric machines and drives, in: 2005 IEEE International Conference, 2005, pp. 1108–1115.
33.
R.D.James and D.Kinderlehrer, Frustration in ferromagnetic materials, Continuum Mech. Thermodyn.2 (1990), 215–239.
34.
R.V.Kohn and V.V.Slastikov, Another thin-film limit of micromagnetics, Arch. Rational Mech. Anal.178 (2005), 227–245.
35.
L.D.Landau and E.M.Lifshitz, On the theory of the dispersion of magnetic permeability in ferromagnetic bodies, Phy. Z. Sowjetunion8 (1935), 153–169; Reproduced by D. ter Haar (ed.), Collected Papers of L.D. Landau, Pergamon Press, New York, 1965, pp. 101–114.
36.
H.Le Dret, Problèmes Variationnels dans le Multi-domaines: Modélisation des Jonctions et Applications, Research in Applied Mathematics, Vol. 19, Masson, Paris, 1991.
37.
K.Santugini-Repiquet, Homogenization of the demagnetization field operator in periodically perforated domains, J. Math. Anal. Appl.334 (2007), 502–516.
38.
J.Simon, Compact sets in the space , J. Ann. Mat. Pura Appl.4(146) (1987), 65–96.
39.
A.Visintin, On Landau–Lifshitz’ equations for ferromagnetism, Jap. J. Appl. Math.2 (1985), 69–84.
40.
E.Zeidler, Nonlinear Functional Analysis and Its Applications. II/B: Nonlinear Monotone Operators, Springer, New York, 1990.