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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 20.61: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

X-PEEM investigation of a magnetoelectric exchange bias system — •Pavel Borisov¹, Andreas Hochstrat¹, Xi Chen¹, Wolfgang Kleemann¹, Thomas Eimüller², Arantxa Fraile-Rodríguez³, and Christoph Quitmann³ — ¹Angewandte Physik, Universität Duisburg-Essen, D-47048 Duisburg, Germany — ²Nachwuchsgruppe Magnetische Mikroskopie, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ³Paul-Scherrer-Institute, SLS, CH-5232 Villigen, Switzerland

Due to the magnetoelectric properties of Cr₂O₃ its antiferromagnetic domain structure can be changed after cooling through the Néel-Temperature in simultaneously applied magnetic and electric fields. Based on this we could show [1] the complete switching of the perpendicular exchange bias field from positive to negative values and vice versa by variation of an applied electric freezing field for the system Cr₂O₃/[Co/Pt]_n. In order to image uncompensated spins at the ferromagnetic-antiferromagnetic interface X-ray photoelectron emission microscopy (X-PEEM) was performed on Al₂O₃(0001)/Pt/Cr₂O₃/ [Co/Pt]_n heterolayers after cooling in the same magnetic, but in opposite electric freezing fields. The orientation of the uncompensated spins and the magnetic structure at the interface, measured at the Cr and the Co L_3,2 absorption edges, are discussed.

[1] P. Borisov et. al., Phys. Rev. Lett. 94, 117203 (2005)