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 20.88: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Collective behavior of artificial magnetic dipoles — •Alexandra Schumann1, Arndt Remhof1, Andreas Westphalen1, Thorsten Last2, Ulrich Kunze2, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum — 2Lehrstuhl für Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum
We have studied the remanent state and the remagnetization behavior of periodic arrays of rectangular shaped Py magnetic dipoles (Ni80Fe20, 0.3µm×3µm×30nm) arranged in an open window type structure. The magnetic islands were prepared by e-beam lithography and ion-beam etching. The magnetic hysteresis was analyzed by vector MOKE and SQUID magnetometry. Images of the domain structure in remanence were taken by MFM. The open window like dipole array is a frustrated system, and several ground states can be realized, such as the onion-state, the horseshoe-state and the vortex state. The aim of the present work was to analyze the stability of each of the states as a function of field direction and gap size between the dipoles. Furthermore, we have studied the long range order of the magnetic dipole arrangement via Bragg-MOKE.
This project was supported by the DFG via SFB491.