Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 29: Magnetic Thin Films IV
MA 29.5: Vortrag
Donnerstag, 30. März 2006, 16:15–16:30, HSZ 03
New magnetic order in Fe/Fe-oxide superlattices — •Th. Diederich1, R. Röhlsberger1, S. Stankov2, and R. Rüffer2 — 1Deutsches Elektronen Synchrotron DESY, Notkestr.85, 22607 Hamburg — 2European Synchrotron Radiation Facility ESRF, B.P. 220, 38042 Grenoble Cedex, France
We have studied the magnetic structure of multilayer systems consisting of Fe and native Fe-oxide. The Fe layers have been produced by magnetron sputtering. Native oxide layers on the Fe were prepared by subsequent dosage of oxygen into the chamber. The samples have been prepared in an UHV system and were analysed in-situ by Nuclear Resonant Scattering (NRS). Ultrathin layers of 57Fe are used to probe the magnetic structure of the Fe and the Fe-oxide layers with very high spatial resolution. Surface oxide layers coupled to the metallic Fe appeared to be nonmagnetic at room temperature. After deposition of another Fe layer one observes a ferromagnetically ordered component in the Fe-oxide layer that increases with growing thickness of the iron capping layer. This results in a relatively high magnetization of these buried oxide layers [1]. In an Fe/57Fe-oxide superlattice we discovered a new type of interlayer coupling that results in superstructure Bragg peaks of the nuclear resonant reflectivity [2]. These observations point to an antiferromagnetically ordered spin arrangement within the lattice of Fe-oxide layers.
[1] G.S.D. Beach et al. Phys. Rev. Lett. 91, 267201 (2003).
[2] Th. Diederich, R. Röhlsberger et al., to be published.