Sabino Maggi

 

Sabino Maggi Sabino Maggi
+39 080 5929158
+39 080 5929170
sabino.maggiATic.cnr.it
Via G. Amendola 122/O, I-70126, Bari, Italy

 

 

 

 

Present position :


- Senior Scientist

 

Short CV :


Sabino Maggi holds a Ph. D. in Physics from the University of Torino, Italy. He worked for two years at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig (Germany) developing the technology of fabrication of the new Nb/Al-AlOx/Nb Josephson junctions. After a half-year stay at the Dept. of Physics of the University of Salerno, he joined the Italian National Metrology Institute (formerly IENGF, now INRiM), Torino, where he has worked for nearly twenty years in the field of superconducting electronics, characterization of thin film structures and cryogenic electromagnetic measurements. He was one of the main contributors to starting and setting up the Thin Film Lab at INRiM, which has grown since to be one of the largest European facilities for the fabrication and characterization of thin-film superconducting devices. He has been associated for several years to the INFN (National Institute for Nuclear Physics), developing a prototype superconducting strip detector for high-energy physics. He has also collaborated with the Italian and European Space Agencies to the development of STJ X-ray detectors and rf mixers for astrophysics applications. He has been a faculty associate of the Materials Science Dept. of the University of Torino. He has published more than 80 research papers in international refereed journals and conference proceedings. He is at the Institute of Crystallography of CNR since 2008.

 

Research Activity :

Sabino Maggi has focused his research activity on the fabrication and electrical characterization at cryogenic temperatures of Josephson tunnel junctions and arrays for the voltage standard and for superconducting electronics.
This research has led to the development of novel fabrication techniques and to the study of the crystal structure and surface morphology of thin film multilayers using several different characterization tools, such as AFM, SEM, AES, XRD, texture analysis and anodic profilometry, with the aim of optimizing the electrical properties of the single films and of the whole tunnel junctions at low temperatures. In parallel, he has investigated the interaction between superconducting tunnel junctions and external electromagnetic fields both experimentally and by simulating the response of the Josephson junctions to a pulsed rf radiation or to a static magnetic field, leading to nonlinear phenomena and to chaotic behavior.
He has been associated for several years with the INFN (National Institute for Nuclear Physics) to develop superconducting strip position detectors for high-energy physics, using proximized films of Nb and Al. These detectors have also shown evidence of weak localization, a phenomenon never observed previously in such a simple device. Another long-standing research collaboration with the Italian and European Space Agencies has led the development of superconducting radiation mixers at 90 and 300 GHz and of STJ detectors, ultra-sensitive cryogenic detectors from X-rays to the ultraviolet working at temperatures of a few hundreds of mK.
To overcome the limitations of optical lithography he has started the development of step junctions, i.e., superconducting devices where the tunnel area is located on the edge of the multilayer structure, thus allowing the fabrication of nanometer-sized junctions using standard photolithographic equipment.
At the Institute of Crystallography of the CNR his main research interests are in X-ray diffraction measurements and crystal structure determination of organometallic compounds and pharmaceuticals.

 

Selected publications :

1. M. Aresta, A. Dibenedetto, P. Stufano, B. M. Aresta, S. Maggi, I. Pápai, T. A. Rokob and B. Gabriele, "The solid state structure and reactivity of NbCl5•(N,N′-dicyclohexylurea) in solution: evidence for co-ordinated urea dehydration to the relevant carbodiimide", Dalton Trans. vol. 39, pp. 6985-6992 (2010), doi: 10.1039/c001669a.


2. V. Lacquaniti, N. De Leo, M. Fretto, S. Maggi, a. Sosso, "Nb/Al-AlOx/Nb overdamped Josephson junctions above 4.2 K for voltage metrology", Applied Physics Letters, vol. 91, pp. 252505 (2007), doi: 10.1063/1.2825469.


3. S. Maggi, N. De Leo, V. Lacquaniti, A. Agostino, R. Gonnelli, P. Verhoeve, "Nb/Al STJ Detectors with Sub-nA Subgap Current", Physica C, vol. 435, pp. 103-106 (2006), doi: 10.1016/j.physc.2006.01.024.


4. V. Lacquaniti, C. Cagliero, S. Maggi, R. Steni, "Overdamped Nb/Al-AlOx/Nb Josephson junctions", Applied Physics Letters, vol. 86, p. 042501 (2005), doi: 10.1063/1.1856135.


5. S. Maggi, "Step width enhancement in a pulse-driven Josephson junction", Journal of Applied Physics, vol. 79, pp. 7860-7863 (1996), doi: 10.1063/1.362395.