Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.48: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Electrical control of the exchange bias effect — •Andreas Hochstrat, Christian Binek, and Wolfgang Kleemann — Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität Duisburg, D-47048 Duisburg

Chromium trioxide (α -Cr₂O₃) is an antiferromagnetic crystal of corundum type-structure. As expected from symmetry considerations, it shows magnetoelectrical behaviour. This means that an applied electrical field gives rise to a net magnetic moment. Using Superconducting Quantum Interfernence Device Magnetometry we investigate the induced axial magnetic moment, which is generated by an electric field applied perpendicular to the (111)-plane. Moreover, we grow a ferromagnetic Co-Pt multilayer by molecular beam epitaxy on top of the (111) surface of a single crystal of α -Cr₂O₃. The axial electric field induced magnetic interface moment couples to the ferromagnetic Co-Pt-layer giving rise to an exchange-bias-effect. According to the phenomenological approach of Meiklejohn and Bean this opens a possibility to control the value of the exchange bias by varying the voltage applied to the system. We investigate the electrically controlled exchange bias as a function of the electric field, the applied magnetic freezing field and the temperature.