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Linearity of a digital SQUID magnetometer
A digital SQUID magnetometer measures magnetic fields by counting integer magnetic flux quanta within its superconducting input loop. Although resolution is limited in comparison to analog SQUID systems,...
PublicationsComparison of RSFQ logic cells with and without phase shifting elements by means of BER measurements
Rapid single flux quantum (RSFQ) electronics is characterized by a very low switching energy. This advantage leads to a noise susceptibility which becomes a challenge for large-scale circuits as well as...
PublicationsReduced power consumption in superconducting electronics
Rapid single flux quantum (RSFQ) electronics is based on the Josephson junction as active switching element. In standard RSFQ circuits its switching energy is much lower than the static power consumption...
PublicationsTime-domain multiplexed SQUID readout of a bolometer camera for APEX
We describe the development and fabrication of the sub-millimeter APEX bolometer camera (SABOCA) and its installation at the APEX radio telescope in Chile. SABOCA has 37 bolometers for a wavelength of...
PublicationsEnhanced Nucleation of Vortices in Soft Magnetic Materials Prepared by Silica Nanosphere Lithography
Magnetic vortices show promise as data storage structures, however the vortex formation process imposes a lower limit on the element's size. In this article a technique is presented, which application...
PublicationsHighly efficient Yb-doped silica fibers prepared by powder sinter technology
We report on the characteristics of an active fiber with core material made by sintering of Yb-doped silica powders as an alternative to conventional modified chemical vapor deposition (MCVD) technique....
PublicationsAnisotropy of the paramagnetic susceptibility of NdGaO3 single crystals
The tensor of the paramagnetic susceptibility χ of NdGaO3 single crystals was determined with high accuracy in the temperature range of T = (5-300) K. A vibrating sample magnetometer was used to determine...
PublicationsDirect observation of antiferromagnetically oriented spin vortex states in magnetic multilayer elements
We report on the coupling of spin vortices in magnetic multilayer elements. The magnetization distribution in thin film disks consisting of two ferromagnetic layers separated by a nonmagnetic spacer is...
PublicationsCharacterization of a digital squid for magnetic field measurements with high dynamic range
Measurements of extremely weak magnetic fields in unshielded environments require sensors providing a high dynamic range and slew rate while maintaining a high resolution. At present, analog Superconducting...
PublicationsInvestigation of the relationship between the gray zone and the clock frequency of a Josephson comparator
The Josephson comparator is one of the fundamental building blocks of Rapid Single Flux Quantum (RSFQ) electronics. Within this electronic family it is the exclusive device which provides logical data...
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