Alexandra Kohn

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Transmission electron microscopy (TEM) is employed to characterize ex situ the interface between the bottom Fe (001) electrode and MgO (001) barrier in a magnetic tunnel junction (MTJ) deposited by molecular beam epitaxy. High resolution TEM images are compared with multislice-based simulations of oxidized and sharp interfaces to conclude that at least the(More)
The Heusler alloys Co2MnSi and NiMnSb are predicted to be 100% spin-polarized and are leading candidate materials for spin-injection and detection in hybrid spintronic devices. Co2MnSi is lattice matched with GaAs, whereas NiMnSb is strongly mismatched to GaAs. Here, we study the temperature and thickness dependence of the anomalous Hall (AH) effect in a(More)
Epitaxial Fe/MgO/Fe magnetic tunnel junctions (MTJs) were grown on MgO(001) substrates by molecular beam epitaxy. The epitaxial structure has been characterized using in-situ reflection high energy diffraction, ex-situ X-ray diffraction, and high-resolution transmission electron microscopy. The magnetic and transport properties have been investigated using(More)
The magnetization reversal mechanism of exchange-biased thin layers with different antiferromagnetic (AFM) layer thicknesses has been investigated using Lorentz transmission electron microscopy. The polycrystalline IrMn and amorphous CoFeB bilayers exhibit unidirectional anisotropy, which was induced by field annealing. Lorentz analyses revealed that the(More)
Reindeer are able to eat and utilize lichens as an important source of energy and nutrients. In the current study, the activities of antibiotic secondary metabolites including usnic, antranoric, fumarprotocetraric, and lobaric acid commonly found in lichens were tested against a collection of 26 anaerobic rumen bacterial isolates from reindeer (Rangifer(More)
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