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2 Acta Physica Polonica A

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

100%

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

100%

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.