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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 20.63: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Domain structure during magnetization reversal of PtMn/CoFe exchange bias micro-patterned lines — •Maciej Oskar Liedke1,2, Kay Potzger1, Burkard Hillebrands2, Marc Rickart3, Paulo Freitas3, and Jürgen Fassbender1 — 1FZ Rossendorf, P.O. box 510119, 01314 Dresden, Germany — 2TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany — 3INESC MN, Rua Alves Redol 9-1, 1000 Lisbon, Portugal
In order to investigate the relation between shape anisotropy and unidirectional anisotropy in exchange biased stripes, the magnetic domain configuration during magnetization reversal was studied as a function of the ratio between both anisotropy contributions. For that purpose a number of PtMn/CoFe samples were prepared by sputter deposition. By means of optical lithography several line pattern in micron length range have been prepared. In order to modify the ratio between both anisotropy contributions the exchange bias field strength was reduced by means of 5 keV He+ ion irradiation. The domain structure during magnetization reversal was then investigated by means of magnetic force microscopy. For the as-prepared samples a mono-domain magnetization state with the magnetization direction aligned along the exchange bias field direction was found regardless of its shape. After irradiation the homogeneous magnetization state broke up into small domains with 360∘ domain walls in between. The appearance of these domain walls was only observed for the descending branch of the magnetization reversal. In addition it was found that the number of domain walls created depends strongly on the stripe width and orientation.