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Peter Grünberg Institute / Institute of Complex Systems
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Functional Oxides

Our research activities are focused on:

  • the development of complex oxide thin film systems,
  • the analysis, understanding and engineering of their physical and electronic properties,
  • their application in the field of microwave and sensor devices for bio and chemical applications.

Special emphasis is placed on the physics of nanoscale dielectric,  ferroelectric and superconducting oxide systems.

Our research encompasses the following topics:

Functional oxides

Complex Oxide Films

Our research activities are focused on the development and optimization of the deposition process for oxide thin films ranging from high-k materials to high-temperature superconductors.  Special aspects are the impact of the activation of oxides during the deposition and effect of preparation-induced strain on the structural and electronic properties of the layers.

Ferroelectric Sensors

Ferroelectric Sensors

In contrast to bulk di/ferroelectrics, thin film di/ferroelectrics can be integrated into small complex thin film devices. Furthermore, the epitaxial growth of thin films offers the possibility to modify the dielectric or ferroelectric properties to a certain degree. As a result of the integration and engineering of the properties, an improved or novel functionality in the form of microwave or sensor devices can be achieved.

Fluxonic devices

Fluxonic devices

Here we focus on the manipulation of vortex matter via micro- and nanostructures in high-Tc films. Vortex and antivortices are generated, which are then trapped, guided and annealed via artificial structures, leading to the improved performance of existing devices (SQUIDs and microwave devices). Furthermore, novel fluxon functionalities can be achieved, e.g. vortex diodes.

Additional Information

Contact:

Prof. Dr. Roger Wördenweber

Tel.:  +49-2461-61-2365
e-mail: r.woerdenweber@fz-juelich.de

References:

Wördenweber, R. ; Grellmann, T. ; Greben, K. ; Schubert, Jürgen ; Kutzner, R. ; Hollmann, E., Stress Generated Modifications of Structural and Morphologic Properties of Epitaxial SrTiO3 Films on Sapphire, Ferroelectrics 430, 57-64 (2012)

 

Wördenweber, R. ; Hollmann, E. ; Schubert, J. ; Kutzner, R. ; Panaitov, G., Flux transport in nanostructured high-Tc films at microwave frequencies, Physica C 479, 69-73 (2012)

 

R. Wördenweber, E. Hollmann, J. Schubert, R. Kutzner, and G. Panaitov,  Regimes of flux transport at microwave frequencies in nanostructured high-Tc films,Phys. Rev. B 85, 064503 (2012)

 

Vestgården, J. I.; Yurchenko, V. V.; Wördenweber, R.; Johansen, T. H.,  Mechanism for flux guidance by micrometric antidot arrays in superconducting films , Physical Review B, 85 (2012) 1, 014516

  

Jin, B.B.; Zhu, B.Y.; Wördenweber, R.; de Souza Silva, C.C.; Wu, P.H.; Moshchalkov, V.V., High-frequency vortex ratchet effect in a superconducting film with a nanoengineered array of asymmetric pinning sites, Physical Review B, 81 (2010) 17, 174505

 

Laviano, F.; Ghigo, G.; Mezzetti, E.; Hollmann, E.; Wördenweber, R.,  Control of the vortex flow in microchannel arrays produced in YBCO films by heavy-ion lithography, Physica C, 470 (2010) 19, 844 – 847

 

Wördenweber, R.; Hollmann, E.; Schubert, J.; Kutzner, R.; Ghosh, A.K., Vortex motion in high-Tc films and a micropattern-induced phase transition, Physica C, 470 (2010) 19, 835 – 839

 

Wördenweber, R. , Ferroelectric Thin Layers , Bhattacharya P, Fornari R, and Kamimura H, (eds.), comprehensive Semiconductor Science and Technology, volume 4, Amsterdam: Elsevier, 2011,  pp. 177–205.

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