Optimisation of high temperature superconductors dc-squids device structures for its incorporation into an squid microscope

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Project objective

Research objectives and content The objectives of the project are: (1) Optimisation of High Temperature Semiconductors (HTS) dc- Superconducting Quantum Interference Devices (SQUIDs) device structures by submicron photolithography and ion beam etching in order to tune the critical current and enhance the dynamic resistance for application of APF. (2) Design of the first version HTS dc SQUID system with additional positive feedback (APF) and external control electronics for tuning with reset function. (3) Improve the design by incorporating HTS inductors and input coil structures based on our HTS multilayer technology. (4) Incorporation of the optimised HTS dc SQUID systems into the SQUID microscope. (5) Biomagnetic investigations with the SQUID microscope. Training content (objective, benefit and expected impact) - Deposition of HTS thin films and multilayers by laser ablation. - Characterisation of thin films by x-ray, SEM, AFM/STM, susceptibility and resistivity. - Processing and fabrication of HTS multilayer device structures by ultra-violet-photolithography with submicron resolution and ion beam etching. - Development of readout electronics for APF. - Measurements of basic properties of APF enhanced HTS SQUID device structures such as energy resolution, noise properties, bandwidth and dynamic range. - Implementation the SQUID sensor and readout electronic in a SQUID microscopes for biomagnetic applications. The main benefit will be to obtain a global scope in the sensor fabrication . Links with industry / industrial relevance (22) Industrial relevance: Ongoing collaboration with Oxford Instruments (Cambridge Science Park)

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Participants

• Aristotle University of Thessaloniki · ThessalonikiCoordinatorGreece

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