Berlin 2005 – wissenschaftliches Programm
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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 20.63: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Exchange bias effects in [Pt/Co] - IrMn multilayers with perpendicular anisotropy — •S. Brück1, J. Sort1,2, V. Baltz2, B. Rodmacq2, B. Dieny2, S. Suriñach1, J. S. Muñoz1, M. D. Baró1, and J. Nogués3 — 1Dept. de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain — 2SPINTEC, CEA/Grenoble, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France — 3Institució Catalana de Recerca i Estudis Avançats (ICREA) and Dept. de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Exchange coupled [Pt/Co]-IrMn multilayers (ML), where IrMn is antiferromagnetic at room temperature, exhibit simultaneously a perpendicular to film magnetic effective anisotropy and a shift of the hysteresis loop along the magnetic field axis (i.e., perpendicular exchange bias). By varying the thickness of the Co layers in the ML or by inserting a Pt spacer between the ML and the AFM the magnitudes of both, the exchange bias field HE and the coercivity HC, can be accurately tailored. The perpendicular magnetic anisotropy is found to play a significant role on the shape of the hysteresis loops and the exchange bias effects. Some outstanding properties of the [Pt/Co]-IrMn ML compared to the commonly studied ferromagnetic-antiferromagnetic bilayers with in-plane anisotropy will be discussed. Our results are particularly appealing for the design of novel types of magnetic reading heads consisting of spin valves or magnetic tunnel junctions with perpendicular anisotropy.