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Münster 1999 – scientific programme

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AM: Magnetismus

AM 10: Postersitzung

AM 10.55: Poster

Tuesday, March 23, 1999, 16:15–20:00, F\"urstenberghaus

Structure and magnetic properties of exchange biased Fe/MnPd bilayers — •Y.J. Tang, B. Roos, T. Mewes, S.O. Demokritov, and B. Hillebrands — Fachbereich Physik, Universit"at Kaiserslautern, Erwin-Schr"odinger-Str. 56, 67663 Kaiserslautern

Antiferromagnetic MnPd has been used as the pinning layer in the polycrystalline exchange bias system Fe/MnPd. Samples of the type Si/SiO2/Fe(tFe)/MnPd(200Å )/ Pd (20Å ) were produced using UHV evaporation in a magnetic field applied parallel to the sample surface. The thickness tFe of the Fe layer was either fixed at 30Å or varied in a wedge-shaped geometry between 20Å and 160Å. The structure of the MnPd layer was characterized by X-ray analysis. We found the antiferromagnetic fct phase of MnPd, leading to a strong exchange bias effect of the bilayer system, without the necessity of an annealing step.
Magneto-optic Kerr effect measurements reveal a linearly decreasing exchange bias field of 50 Oe to 5 Oe with increasing Fe thickness. The dependence of the magnetization curves as a function of the in-plane angle of the applied field with respect to the direction of the growth field was measured. The data is well reproduced by a model fit, assuminugfoldnly rotation processes, and anisotropy contributions of unidirecitonal, uniaxial and forth order. All three anisotropy contributions show an exchange-bias induced 1/tFe  dependence.

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