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4 Acta Physica Polonica A

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Superconductivity and Magnetism in Nd_{0.5}Sr_{0.5}MnO_3/YBa_2Cu_3O_7 Superlattices

100%

Tsarou A. , Paszkowicz W. , Minikayev R. , Dłużewski P. , Sawicki M. , Przysłupski P.

Acta Physica Polonica A

2007

tom 111

nr 1

179-183

We report the synthesis and characterization of Nd_{0.5}Sr_{0.5}MnO_3/YBa_2Cu_3O_7 superlattices. X-ray diffraction studies show that the superlattices are [001] oriented. We observe that the magnetic ground state of Nd_{0.5}Sr_{0.5}MnO_3 system in a multilayered structure is strongly dependent on the substrate.

Magneto-Optics of Spontaneous and Field Induced Vortices in Twinned YBa_2Cu_3O_{7-δ}/La_{1-x}Sr_xMnO_3 Bilayers

84%

Gerbaldo R. , Ghigo G. , Gozzelino L. , Laviano F. , Mezzetti E. , Minetti B. , Przysłupski P. , Tsarou A. , Wiśniewski A.

Acta Physica Polonica A

2007

tom 111

nr 1

47-55

The electromagnetic coupling between the magnetic and the superconducting layers in perovskite heterostructures is investigated by means of the magneto-optical technique. The quantitative imaging of the magnetic field distribution allows the high-resolution reconstruction of local supercurrent density. Two phenomena arising from the coupling between manganite layer and the YBa_2Cu_3O_{7-δ} superconducting film deposited on top are addressed, i.e., the local effects of the electronic coupling between the compounds and the interaction between the manganite magnetic moments and the vortices in the superconductor. The first issue can be quantified in terms of the local superfluid density depression/enhancement in correspondence to the underlying magnetic structure, both domains and domain walls (in dependence on the orientation and sign of the local magnetization) and of the spontaneous, macroscopic screening current loops generated by the manganite domain walls. The interaction between the local manganite magnetization and the superconducting vortices is also influenced by structural defects because they modulate the magnetic pattern of the manganite. Different channelling phenomena in correspondence to the natural twin boundaries of the substrate, but locally magnetized by pinned domain walls of the manganite on their locations, are recognized.

Multifunctional La_{0.7}Sr_{0.3}MnO_3-YBa_2Cu_3O_7 Heterostructures

84%

Przyslupski P. , Dybko K. , Tsarou A. , Werner-Malento K. , Sawicki M. , Laviano F. , Gozzellino L. , Mezzetti E.

Acta Physica Polonica A

2008

tom 114

nr 1

15-22

Complex perovskite oxides exhibit a rich spectrum of functional responses such as: superconductivity, magnetism etc. Combination of different oxides in multilayered structures increases the number of physical responses. Heterogeneous oxide structures represent a new class of nanostructures. They consist of ferromagnetic La_{0.67}Sr_{0.33}MnO_3 (F-LSMO) manganite and superconducting YBa_2Cu_3O_7 (Sc-YBCO) cuprate. The interaction between the two order parameters gives rise to new physical effects. In this review we will discuss various physical effects obtained in the bilayer and trilayer heterostructures. For example, the LSMO/YBCO bilayer structures are used to study the mechanism of magnetic pinning. The other possibility is the fabrication of spin valve-like structures LSMO/YBCO/LSMO. The spin dependent transport in trilayer structure was studied taking into account crossed Andreev reflection and electron co-tunneling processes.

Structure and Magnetic Characterization οf BiFeO_3/YBa_2Cu_3O_7 Bilayers

84%

Werner-Malento K. , Tsarou A. , Dluzewski P. , Paszkowicz W. , Minikayev R. , Sawicki M. , van der Beek K. , Konczykowski M. , Przyslupski P.

Acta Physica Polonica A

2009

tom 115

nr 1

95-97

Bilayered epitaxial BiFeO_3/YBa_2Cu_3O_7 films were fabricated on (100) [(LaAlO_3)_{0.3}(Sr_2TaAlO_6)_{0.7}] substrates by sputtering method. For structural comparison the bilayered BiFeO_3/La_{0.67}Sr_{0.33}MnO_3 films were also deposited on (100) SrTiO_3 substrates. A weak ferromagnetic moment is observed in BiFeO_3/YBa_2Cu_3O_7 films. The mechanism responsible for weak ferromagnetic moment arises presumably from the epitaxy strain induced canted antiferromagnetic structure.