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 20.29: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magnetic Domain Structures of Microstructured Fe3O4(100) Thin Films — •Christine Hartung1, Mikhail Fonin1, Markus Laufenberg1, Wolfgang Bührer1, Dirk Backes2, L. J. Heyderman2, Fritjof Nolting2, Mathias Kläui1, and Ulrich Rüdiger1 — 1Fachbereich Physik, Universität Konstanz, 78457 — 2Paul Scherrer Institut, 5232 Villigen
Recently the switching of magnetic structures by current induced domain wall (DW) propagation (CIDP) has been intensively investigated as an alternative to conventional switching by external magnetic fields [1]. However the current densities needed for the DW displacement in NiFe microstructures [1] are too high for use in spintronic devices. This obstacle might be overcome by using materials with high spin polarization (P) and low saturation magnetization (Ms), since the strength of the spin torque effect, which is the origin of the DW motion, was predicted to be directly proportional to P/Ms [2]. Magnetite, Fe3O4(100), combining high values of P at EF with relatively low Ms, is a promising material for CIDP experiments. Before carrying out CIDP experiments, a thorough investigation of the magnetic domain configuration in Fe3O4 microstructures is mandatory. For this purpose, thin Fe3O4(100) films were prepared by molecular beam epitaxy and patterned by electron beam lithography. Subsequently the magnetic domain structure was investigated by means of x-ray circular dichroism photoemession electron microscopy and magnetic force microscopy.
[1] M. Kläui et al., Phys. Rev. Lett. 94, 106601 (2005).
[2] Z. Li and S. Zhang, Phys. Rev. B 70, 24417 (2004).