# American Institute of Mathematical Sciences

June  2011, 1(2): 129-147. doi: 10.3934/mcrf.2011.1.129

## Control of a network of magnetic ellipsoidal samples

 1 Indian Institute of Technology Madras, Department of Mathematics, Chennai - 600 036, India 2 IMB, Université Bordeaux, 351 cours la Libération, 33405 Talence, France 3 Laboratoire Jean Kuntzmann, Université de Grenoble, Tour IRMA, 51 rue des Mathématiques, BP 53, 38041 Grenoble Cedex 9, France 4 Department of Automatic Control, Gipsa-lab, 961 rue de la Houille Blanche, BP 46, 38402 Grenoble Cedex, France

Received  October 2010 Revised  February 2011 Published  June 2011

In this work, we present a mathematical study of stability and controllability of one-dimensional network of ferromagnetic particles. The control is the magnetic field generated by a dipole whose position and whose amplitude can be selected. The evolution of the magnetic field in the network of particles is described by the Landau-Lifschitz equation. First, we model a network of ellipsoidal shape ferromagnetic particles. Then, we prove the stability of relevant configurations and discuss the controllability by the means of the external magnetic field induced by the magnetic dipole. Finally some numerical results illustrate the stability and the controllability results.
Citation: Shruti Agarwal, Gilles Carbou, Stéphane Labbé, Christophe Prieur. Control of a network of magnetic ellipsoidal samples. Mathematical Control & Related Fields, 2011, 1 (2) : 129-147. doi: 10.3934/mcrf.2011.1.129
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##### References:
 [1] François Alouges and Karine Beauchard, Magnetization switching on small ferromagnetic ellipsoidal samples,, ESAIM Control Optim. Calc. Var., 15 (2009), 676. doi: 10.1051/cocv:2008047. Google Scholar [2] François Alouges and Alain Soyeur, On global weak solutions for Landau-Lifshitz equations: Existence and nonuniqueness,, Nonlinear Anal., 18 (1992), 1071. doi: 10.1016/0362-546X(92)90196-L. Google Scholar [3] S. W. Anwane, "Fundamentals of Electromagnetic Fields,", Infinity Science Press, (2007). Google Scholar [4] L'ubomír Baňas, Sören Bartels and Andreas Prohl, A convergent implicit finite element discretization of the Maxwell-Landau-Lifshitz-Gilbert equation,, SIAM J. Numer. Anal., 46 (2008), 1399. doi: 10.1137/070683064. Google Scholar [5] William F. Brown, "Micromagnetics,", Wiley, (1963). Google Scholar [6] Gilles Carbou, Stability of static walls for a three-dimensional model of ferromagnetic material,, J. Math. Pures Appl., 93 (2010), 183. doi: 10.1016/j.matpur.2009.10.004. Google Scholar [7] Gilles Carbou and Pierre Fabrie, Regular solutions for Landau-Lifschitz equation in a bounded domain,, Differential Integral Equations, 14 (2001), 213. Google Scholar [8] Gilles Carbou and Pierre Fabrie, Regular solutions for Landau-Lifschitz equation in $\R^3$,, Commun. Appl. Anal., 5 (2001), 17. Google Scholar [9] Gilles Carbou, Stéphane Labbé and Emmanuel Trélat, Control of travelling walls in a ferromagnetic nanowire,, Discrete Contin. Dyn. Syst., 1 (2008), 51. Google Scholar [10] Shijin Ding, Boling Guo, Junyu Lin and Ming Zeng, Global existence of weak solutions for Landau-Lifshitz-Maxwell equations,, Discrete Contin. Dyn. Syst., 17 (2007), 867. doi: 10.3934/dcds.2007.17.867. Google Scholar [11] Boling Guo and Fengqiu Su, Global weak solution for the Landau-Lifshitz-Maxwell equation in three space dimensions,, J. Math. Anal. Appl., 211 (1997), 326. doi: 10.1006/jmaa.1997.5467. Google Scholar [12] D. J. Griffiths, "Introduction to Electrodynamics,", 3rd edition, (2008). Google Scholar [13] Stéphane Labbé, "Simulation Numérique du Comportement Hyperfréquence des Matériaux Ferromagnétiques,", Editions Universitaires Européennes, (2010). Google Scholar [14] Stéphane Labbé, Fast computation for large magnetostatic systems adapted for micromagnetism,, SIAM J. Sci. Comp., 26 (2005), 2160. doi: 10.1137/030601053. Google Scholar [15] Stéphane Labbé and Pierre-Yves Bertin, Microwave polarisability of ferrite particles with non-uniform magnetization,, Journal of Magnetism and Magnetic Materials, 206 (1999), 93. doi: 10.1016/S0304-8853(99)00537-5. Google Scholar [16] L. Landau and E. Lifschitz, "Electrodynamique des Milieux Continus, Cours de Physique Théorique,", (French) [Electrodynamic of Continuous Media, VIII (1969). Google Scholar [17] J. A. Osborn, Demagnetizing factors of the general ellipsoid,, Phys. Rev., 67 (1945), 351. doi: 10.1103/PhysRev.67.351. Google Scholar [18] Augusto Visintin, On Landau Lifschitz equation for ferromagnetism,, Japan Journal of Applied Mathematics, 1 (1985), 69. doi: 10.1007/BF03167039. Google Scholar
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