Berlin 2005 – scientific programme
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.22: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU C
Electric control of exchange bias — •Pavel Borisov, Andreas Hochstrat, Xi Chen, and Wolfgang Kleemann — Universität Duisburg-Essen, Angew. Physik, 47048 Duisburg
Gaining electric control on the Exchange Bias (EB) is one of the most challenging tasks in modern thin film magnetism. Apart from direct control of the EB by an applied electric field at a given temperature T<TN, also the complete switching of the EB from positive to negative values and vice versa by a variation of the applied electric freezing field is possible. We realized the demonstration of this huge effect in Molecular Beam Epitaxy grown magnetic Co-Pt-heterostructures based on antiferromagnetic Cr2O3, the prototypical system for investigations of the magneto-electric (ME) effect. The magnetic characterization was done by means of polar Magneto-Optical Kerr Effect as well as by SQUID-magnetometry. ME controlled perpendicular EB opens access to a broad variety of new applications in data storage technology, as there are e.g. a new design for a thermally assisted writing mechanism for perpendicular recording systems or a way to manage voltage induced writing in MRAM technique. Another spintronic application based on ME EB has been presented recently [1].
[1] Ch. Binek et al., J. Appl. Phys (2005) accepted