Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Exchange Bias
MA 26.3: Vortrag
Donnerstag, 29. März 2007, 15:45–16:00, H10
Multiferroically composed exchange bias systems — •Pavel Borisov, Andreas Hochstrat, and Wolfgang Kleemann — Angewandte Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany
Magnetoelectric (ME) antiferromagnetic Cr2O3, being exchange coupled to a ferromagnetic multilayer (Pt/Co/Pt)n, n≥ 1, is treated as a multiphase multiferroic material with sophisticated multifunctional properties. It is shown that the exchange bias (EB) of the ferromagnetic hysteresis loop cannot only be controlled by the magnetic freezing field, Hfr, but additionally also by an external electric freezing field, Efr, via the ME effect of Cr2O3. Apart from the well-known gradual shift on the magnetic field axis also complete switching from −HEB to +HEB is possible [1]. Based on the latter effect novel electrically controlled spintronic applications like ME MRAM (MERAM) and XOR logic cell (MEXOR) devices have been proposed [2]. These require a proper downscaling of the Cr2O3 component into the nanometer region. We report on recent progress in the preparation of thin films of chromium oxide and corresponding exchange bias systems. Thickness dependences of structural, magnetic and magnetoelectric properties of Cr2O3 thin films are discussed.
[1] P. Borisov et al., Phys. Rev. Lett. 94, 117203 (2005).
[2] X. Chen et al., Appl. Phys. Lett. 89, 202508 (2006).