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2 Materials Science Poland

2 2006

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Week interlayer exchange coupling in Fe-Zr and Fe-Ti layered structures

Smardz L., Smardz K.

Materials Science Poland

2006

Vol. 24, No. 3

821--826

20nm-Fe/dZr-Zr/20nm-Fe and 20nm-Fe/dTi-Ti/20nm-Fe trilayers with wedged Zr and Ti sublayers were prepared at room temperature using UHV (5 × 10-10 mbar) RF/DC magnetron sputtering. Results showed that the Fe sublayers are ferromagnetically coupled up to Zr and Ti spacer thickness of about 1.5 and 2 nm, respectively. Furthermore, a weak antiferromagnetic (ferromagnetic) coupling of the Fe sublayers was observed for a Zr (Ti) thickness range between 1.5 and 3 nm (2 and 3.4 nm). The Fe sublayers are very weakly exchange coupled or decoupled for dZr > 3 nm and dTi > 3.4 nm. The small decoupling Ti and Zr thickness could be explained by spontaneous formation of a quasi-amorphous structure of the paramagnetic spacer during the deposition process.

Magnetism and superconductivity in oxide ferromagnet/superconductor heterostructures

Przysłupski P., Tsarou A., Komissarov I., Dybko K., Dłużewski P., Sawicki M., Dąbrowski B., Kimball C.

Materials Science Poland

2006

Vol. 24, No. 3

665--668

We report on the transport and magnetic properties of La0.67Sr0.33MnO3/YBa2Cu3O7/La0.67Sr0.33MnO3 (LSMO/YBCO/LSMO) trilayer structures. The onset of superconducting transition temperature in trilayer structures starts from the sample with 6 nm (5 unit cells) thick YBCO layer. M(H) hystersis loop indicate indirect exchange coupling between LSMO layers across YBCO layer. MR studies demonstrate a change of magnetoconductance (MC) of a trilayer structure with variation of magnetic field, indicating an indirect exchange coupling between LSMO layers across nonsuperconducting YBCO layer.