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5 results on '"M Bihler"'

2. Magnetically induced anisotropy of flux penetration into strong-pinning superconductor/ferromagnet bilayers

Author

J Simmendinger, J Hänisch, M Bihler, A M Ionescu, M Weigand, M Sieger, R Hühne, H Rijckaert, I van Driessche, G Schütz, and J Albrecht

Subjects
superconductivity, ferromagnet, XMCD, thin film, superconductor/ferromagnet bilayer, Science, Physics, QC1-999
Abstract

We studied the impact of soft ferromagnetic permalloy (Py) on the shielding currents in a strong-pinning superconductor—YBa _2 Cu _3 O _7− _δ with Ba _2 Y(Nb/Ta)O _6 nano-precipitates—by means of scanning transmission x-ray microscopy. Typically and in particular when in the thin film limit, superconductor/ferromagnet (SC/FM) bilayers exhibit isotropic properties of the flux line ensemble at all temperatures. However, in elements with small aspect ratio a significant anisotropy in flux penetration is observed. We explain this effect by local in-plane fields arising from anisotropic magnetic stray fields originated by the ferromagnet. This leads to direction-dependent motion of magnetic vortices inside the SC/FM bilayer. Our results demonstrate that small variations of the magnetic properties can have huge impact on the superconductor.

Published
2019
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3. Magnetically induced anisotropy of flux penetration into strong-pinning superconductor/ferromagnet bilayers

Author

Gisela Schütz, Adrian M. Ionescu, I. Van Driessche, Joachim Albrecht, J. Simmendinger, Jens Hänisch, Ruben Hühne, Markus Weigand, Max Sieger, Hannes Rijckaert, and M. Bihler

Subjects
Permalloy, thin film, General Physics and Astronomy, FILMS, 01 natural sciences, 010305 fluids & plasmas, superconductor, Condensed Matter::Superconductivity, 0103 physical sciences, THICKNESS, ddc:530, Thin film, FIELD, 010306 general physics, Anisotropy, Superconductivity, Physics, Condensed matter physics, XMCD, Bilayer, superconductivity, Isotropy, ferromagnet bilayer, Chemistry, Ferromagnetism, Physics and Astronomy, Electromagnetic shielding, ferromagnet
Abstract

We studied the impact of soft ferromagnetic permalloy (Py) on the shielding currents in a strong-pinning superconductor—YBa2Cu3O7−δ with Ba2Y(Nb/Ta)O6 nano-precipitates—by means of scanning transmission x-ray microscopy. Typically and in particular when in the thin film limit, superconductor/ferromagnet (SC/FM) bilayers exhibit isotropic properties of the flux line ensemble at all temperatures. However, in elements with small aspect ratio a significant anisotropy in flux penetration is observed. We explain this effect by local in-plane fields arising from anisotropic magnetic stray fields originated by the ferromagnet. This leads to direction-dependent motion of magnetic vortices inside the SC/FM bilayer. Our results demonstrate that small variations of the magnetic properties can have huge impact on the superconductor.

Published
2019

5. The effects of non-uniform illumination of solar cells with concentrated light

Author

M. Bihler and H. Pfeiffer

Subjects
Physics, Theory of solar cells, business.industry, Energy conversion efficiency, General Engineering, Non uniform illumination, Luminous intensity, Power (physics), Solar cell efficiency, Optics, Optoelectronics, business, Current density, Short circuit
Abstract

Non-uniform illumination of solar cells leads to a decrease in efficiency. Two cases were investigated experimentally: loss of power due to the shadowing of a fringe area of one cell, and loss of output of two cells which were connected in series and were illuminated to different degrees. The results show that losses due to these effects will reduce the output of concentrator photovoltaic systems working at low concentration conditions by a few per cent only.

Published
1982

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