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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.60: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
α -MnS-based Exchange Bias Systems — •Andreas Hochstrat, Pavel Borisov, Xi Chen, and Wolfgang Kleemann — Angewandte Physik, Universität Duisburg-Essen, D-47048 Duisburg, Germany
With decreasing temperature the NaCl-structure-type antiferromagnetic α -MnS exhibits a phase transition from the paramagnetic to an antiferromagnetic state at Tc1≈ 152 K, while a spin reorientation transition from single- to multiaxis antiferromagnetism occurs at Tc2≈ 129 K [1]. (111)-oriented α -MnS crystals were grown by the vapor transport method. Exchange bias (EB) systems with thin ferromagnetic metal films epitaxially grown on top of these α -MnS crystals show a new type of EB temperature dependence. While the EB field, measured with a Superconducting Quantum Interference Device (SQUID), is normal in the temperature regime Tc2<T<Tc1, it seems to vanish below Tc2.
[1] W. Kleemann and F.J. Schäfer, Solid State Commun. 69, 95 (1989).