Application of conformal mapping to the determination of magnetic moment
distributions in typical antidot film nanostructures |
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Authors: | Osvaldo F Schilling |
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Institution: | (1) Departamento de Fisica, Universidade Federal de Santa Catarina, Campus, Trindade, 88040-900, Florianopolis, SC, Brazil |
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Abstract: | There has been an increasing technological interest on magnetic thin films
containing antidot arrays of hexagonal or square symmetry. Part of this
interest is related to the possibility of domain formation and pinning at
the antidots boundaries. In this paper, we develop an accurate method for
the simulation of the magnetic moments distribution for such arrays. The
method concentrates the calculations on the immediate vicinity of each
antidot. For each antidot distribution (square or hexagonal) a suitable
system of coordinates is defined to exploit the shape of the unit-cells of
the overall nanostructure. The Landau-Lifshitz-Gilbert-Brown equations that
govern the distribution of moments are rewritten in terms of these
coordinates. The moments orientation is calculated as a function of time
until equilibrium is reached, in a Cartesian grid defined for these new
coordinate systems. A conformal transformation is applied to insert the
moment vectors into the actual unit-cell. The resulting vector maps display
quite clearly regions of different moment orientation around the antidots,
which can be associated with nanoscale domains. The results are similar to
the ones obtained by other authors C.C. Wang, A.O. Adeyeye, N. Singh, Nanotechnology 17, 1629 (2006);
C.C. Wang, A.O. Adeyeye, N. Singh, Y.S. Huang, Y.H. Hu, Phys. Rev.
B 72, 174426 (2005);
C.T. Yu, H. Jiang, L. Shen, P. Flanders, G. Mankey, J. Appl. Phys.
87, 6322 (2000);
E. Mengotti, L.J. Heyderman, F. Nolting, B.R. Craig, J.N. Chapman,
L.L. Diaz, R.J. Matelon, U.G. Volkman, M. Klaui, U. Rudiger, C. Vaz, J.
Bland, J. Appl. Phys. 103, 07D509 (2008)] using the NIST oommf method, but
obtained in a much simpler and direct way. |
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Keywords: | PACS" target="_blank">PACS 75 40 Mg Numerical simulation studies 75 70 -i Magnetic properties of thin films surfaces and interfaces |
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