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 20.92: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Maximisation of stray field modulation in periodic arrays of magnetic particles — •Nikolai Mikuszeit1, Juan José de Miguel1, Robert Frömter2, and Hans Peter Oepen2 — 1Dpto. Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 2Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg, Germany
There are many possible applications for periodic arrays of magnetic particles. They can create modulated magnetic potentials for magneto-transport experiments e.g. to realise Hofstadter butterflies; they can be used as storage media or as molecule traps in quantum optics, and therefore in quantum computing. Especially in the first two cases it is not only important to create a strong stray field, but furthermore a strong field modulation e.g. to have a clear separation between neighbouring bits. The stray field of a periodic array can be calculated with standard Fourier methods [1]. However, the typical application is to calculate the stray field of a given experimental structure [2]. In the presented poster we give a systematic study of array symmetries, particle shapes and particle sizes. We show that a large gain in stray field modulation can be achieved by choosing the correct particle size.
[1] R. L. Wallace Jr, Bell Syst. Tech. J. 30 1145 (1951)
[2] R. R. Gerhardts, Phys. Rev. B 53, 11064 (1996)