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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 20.50: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Azimuthal dependence of exchange bias and coercive field of Fe(110)/CoO(111) exchange bias bilayer — •Gregor Nowak, Florin Radu, Kurt Westerholt, and Hartmut Zabel — Experimentalphysik/Festkörperphysik, Ruhr-Univeristät Bochum, 44780 Bochum

We have prepared epitaxial Fe(110)/CoO(111) bilayers and characterized their structure by x-ray diffraction. Structurally, the bilayer shows a single domain growth for the CoO layer with six-fold in-plane symmetry. The Fe layer, however, shows a Nishiyama-Wassermann growth of three equivalent domains. The exchange bias (EB) properties were investigated by SQUID magnetometry. First, we measured the EB field as a function of the field cooling direction. The EB field exhibits a twofold symmetry which defines the uniaxial anisotropy orientation of the AF layer. Then we cooled down the system for different orientations of the applied field with respect to the uniaxial axis of the AF layer. For each field-cooling orientation we recorded hysteresis loops as a function of the azimuth angle of the sample with respect to the applied field. The maximum EB field is not found along the field cooling direction instead we observed this maximum to be parallel to the easy axis of the AF layer. This is in very good agreement with the theoretical predictions of Nowak and Usadel1. Also, the unidirectional behaviour of the EB field shows modulations created by the uniaxial nature of the AF layer anisotropy.
1B. Beckmann, U. Nowak, and K. D. Usadel , Phys. Rev. Lett. 91, 187201 (2003).

This work was supported by SFB 491.

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