Dresden 2006 – scientific programme
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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
Tuesday, March 28, 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 L3,2 absorption edges, are discussed.
[1] P. Borisov et. al., Phys. Rev. Lett. 94, 117203 (2005)