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Vortex Pinning in Ferromagnet/Superconductor Bilayers - the Dependence on the Ferromagnetic Layer and Temperature

100%
Adamus Z., Cieplak M., Abal'oshev A., Berkowski M., Kończykowski M., Cheng X., Shu L., Chien C.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
451-456
EN
The behavior of vortex pinning induced by the magnetic domain reversal is studied in the ferromagnet/superconductor bilayers in which superconducting film is niobium and the ferromagnetic layers are the Co/Pt superlattices with perpendicular magnetic anisotropy. The local magnetic field across narrow ferromagnet/superconductor bilayer stripe is measured using a line of miniature Hall sensors. The pinning is studied for samples with different amount of repeats of Co/Pt superlattice, and as a function of temperature.
2
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Superconducting Pinning by Magnetic Domains in a Ferromagnet-Superconductor Bilayer

100%
Cieplak M., Adamus Z., Konczykowski M., Chen X., Byczuk A., Abal'oshev A., Sang H., Chien C.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
693-698
EN
The local flux profile and the critical current are studied using an array of Hall sensors in a ferromagnetic-superconducting bilayer which consists of niobium film covering ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy. The results indicate about threefold enhancement of the flux pinning in niobium layer caused by the isolated magnetic domains which are created during the magnetization reversal of the Co/Pt multilayer. The geometrical barrier is absent, and the critical current is strongly peaked in close vicinity to the sample center, suggesting that the critical state differs from that predicted by the Bean model.
3
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Flux Penetration in a Ferromagnetic/Superconducting Bilayer

100%
Adamus Z., Cieplak M., Abal'oshev A., Kończykowski M., Cheng X., Zhu L., Chien C.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
95-98
EN
An array of miniature Hall sensors is used to study the magnetic flux penetration in a ferromagnetic/superconducting bilayer consisting of Nb as a superconducting layer and Co/Pt multilayer with perpendicular magnetic anisotropy as a ferromagnetic layer, separated by an amorphous Si layer to avoid the proximity effect. It is found that the magnetic domains in the ferromagnetic layer create a large edge barrier in the superconducting layer which delays flux penetration. The smooth flux profiles observed in the absence of magnetic pinning change into terraced profiles in the presence of domains.
4
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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
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2007
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vol. 111
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issue 1
47-55
EN
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.
5
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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
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2008
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vol. 114
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issue 1
15-22
EN
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.
6
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Vortex Dynamics in Ferromagnetic/Superconducting Bilayers

100%
Cieplak M., Adamus Z., Kończykowski M., Zhu L., Chien C.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
23-28
EN
The dependence of vortex dynamics on the geometry of magnetic domain pattern is studied in the superconducting/ferromagnetic bilayers, in which niobium is a superconductor, and Co/Pt multilayer with perpendicular magnetic anisotropy serves as a ferrromagnetic layer. Magnetic domain patterns with different density of domains per surface area and different domain size, w, are obtained for Co/Pt with different thickness of Pt. The dense patterns of domains with the size comparable to the magnetic penetration depth (w≥λ) produce large vortex pinning and smooth vortex penetration, while less dense patterns with larger domains (w ≫ λ) enhance pinning less effectively and result in flux jumps during flux motion.
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