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Browsing by Author "Roos, B. F. P."

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    Oscillatory Exchange Bias Effect in FeNi/Cu/FeMn and FeNi/Cr/FeMn Trilayer Systems
    (2000) Mewes, T.; Roos, B. F. P.; Demokritov, S. O.; Hillebrands, B.; University of Alabama Tuscaloosa
    The first experimental observation of a spacer-thickness dependent oscillatory exchange bias effect in ferromagnet~FM!/spacer/antiferromagnet trilayers is reported. The period of the oscillatory exchange bias field is found to be half of the period of the oscillatory interlayer coupling in the corresponding FM/spacer/FM systems with the same spacer, indicating that the observed effect is caused by an analogous coupling mechanism, being, however, sensitive to the absolute value of the coupling strength and not on its sign.
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    Structure and Magnetic Properties of Exchange-biased Polycrystalline Fe/MnPd Bilayers
    (2000) Tang, Y. J.; Roos, B. F. P.; Mewes, T.; Frank, A. R.; Rickart, M.; Bauer, M.; Demokritov, S. O.; Hillebrands, B.; Zhou, X.; Liang, B. Q.; Chen, X; Zhan, W. S.; University of Alabama Tuscaloosa
    We report the fabrication of polycrystalline Fe/MnPd bilayers, which show the exchange-bias effects. We show that the exchange-bias effect, described by unidirectional anisotropy, is also accompanied by induced uniaxial and fourfold in-plane anisotropy contributions in the system. Using the Stoner-Wohlfarth model, all in-plane anisotropy contributions to the total free energy are determined for the polycrystalline samples from the fit of the in-plane angular dependence of Heb and the coercivity Hc . A mechanism explaining the presence of the induced higher-order anisotropy contributions in an exchange-bias system is proposed.