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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 20.84: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magnetic domains in CrO2 microstructures — •Alexander Biehler1, Mathias Kläui1, Mikhail Fonin1, Christian König2, Markus Laufenberg1, Wolfgang Bührer1, Gernot Güntherodt2, and Ulrich Rüdiger1 — 1Fachbereich Physik; Universität Konstanz; 78457 Konstanz — 22. Physikalisches Institut; RWTH Aachen; 52056 Aachen
In half-metallic ferromagnetic materials, the majority-spin electrons exhibit metallic character while the minority-spin electrons show a semiconducting gap or vice versa, which leads to complete spin polarization at the Fermi level [1]. This class of materials is thus ideally suited for spin-polarized emitters in magnetic tunneling applications and for investigation of the interaction between highly spin-polarized currents and magnetic domain walls. We have probed the magnetization configuration in CrO2 microstructures using magnetic force microscopy and have observed alternating domains with 180 degree domain walls in wires parallel to the magnetic hard axis. The magnetization switching and domain wall pinning at constrictions has been studied in wires along the easy axis. We have measured the magnetoresistance effects related to domain walls in these elements and have injected current pulses to study current-induced domain wall propagation due to the spin torque effect.
[1] Y. Dedkov et al., Appl. Phys. Lett. 80, 4181 (2002)