Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.130: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Theory of multidomain states in ferro- and antiferomagnetically coupled superlattices with perpendicular anisotropy — •U.K. Rößler¹, I.E. Dragunov², N.S. Kiselev^2,3, and A.N. Bogdanov^1,2 — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Donetsk Institute for Physics and Technology, R. Luxemburg 72, 83114 Donetsk, Ukraine — ³Lugansk State Pedagocial University, Oboronna 2, 91011 Lugansk, Ukraine

We develop a theory of the magnetic domain configurations in magnetic multilayers with perpendicular anisotropy. Integral transformations of the micromagnetic energy yield a system of equations convenient for direct numerical evaluation. A general micromagnetic approach is applied to calculate the parameters of the domain structures in ferromagnetically and antiferromagnetically coupled magnetic nanolayers and to investigate their behaviour under applied magnetic fields. Characteristic features of the multidomain states have been analyzed for different ratios of their characteristic lengths scale l with respect to the thickness of the individual layers h and the thickness of the non-ferromagnetic interlayers a. Simplifications of the theoretical description can be achieved in various limits of these ratios. In particular, many perpendicular multilayers investigated recently in experiments obey the relation l > h ≫ a which imposes strong magnetostatic couplings between adjacent nanolayers. Compared to bulk magnetic properties, these interactions are an uncommon feature of such multilayers. We discuss in detail the peculiarities of their magnetic properties.