Johannes Eisenmenger

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The size dependence of exchange bias field HE and coercivity Hc was studied by measuring exchange biased Fe-FeF2 dot arrays in comparison with an unstructured exchange biased Fe-FeF2 bilayer. The domain sizes in the ferromagnet (FM) and the antiferromagnet (AFM) play an important role for exchange bias (EB), and thus interesting phenomena may be expected(More)
This papers present a novel phenomenon in FM/AF heterostructure systems (AF = FeF<sub>2</sub>, FM= (Ni,Co)), where the FM switching can be also controlled by thermal cycling. It was found that a FM saturated above the AF Neel temperature T<sub>N</sub>, spontaneously reverses its magnetization against a constant field with decreasing temperature. This(More)
The magnetic flux penetration into thin type-II superconducting films with circular defects is investigated. The artificial circular defects ~diameter 540 mm) in an YBa2Cu3O72d thin film ~thickness '300 nm) were prepared by pulse-laser irradiation. The flux penetration into the zero-field-cooled superconducting film was visualized by means of the(More)
Using a reflection magneto-optic technique we have investigated natural inhomogeneities and artificial struetures in YBCO thin films exposed to an external magnetic field. The artificial structures were mechanically scratched by scanning a diamond tip with different loading over the film, surface. AIternatively planar structures with reduced oxygen content(More)
Nanostructured Fe dots were prepared on antiferromagnetic FeF2 thin films and investigated by magneto-optical Kerr effect sMOKEd. We studied the influence of dot sizes on the magnetic hysteresis and compared the result with both continuous thin film bilayers and nanostructured Fe/FeF2 pillars. Hysteresis loops were measured at temperatures below and above(More)
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