MgB2 superconducting thin films on Si and Al2O3 substrates

Electrical and structural properties of MgB2 films prepared by sequential deposition of B and Mg on the NbN-buffered Si(100) substrate

“…Microwave losses measured by MMMA showed the presence of weak link-type losses at the transition of the sample into the superconducting state only (Fig.3, B mod = 0.05 mT). This is in contrary to our previous results obtained in 1,4 where weak link losses were observed in large temperature range below T C0 too. At small modulation amplitude and lower temperatures too, only viscous vortex motion type losses are present (Fig.3, B mod = 0.02 mT).…”

“…It can be a consequence of the additional annealing of the NbN during in-situ thermal treatment of the as-deposited B-Mg double layer. No rings, unlike to other authors, 4,5 belonging to the MgO particles were observed.…”

“…Rutheford Backscattering Spectroscopy (RBS) analysis has revealed 2 film is usually linked with the creation of the MgO particles which may negatively influence superconducting properties. 4,5 The Si substrates which are the most attractive substrates for the applications of the MgB 2 films offer an MgB 2 film with zero resistance critical temperature below T C0 ≈ 27 K. 1,3,4 We have observed an interaction of the Si substrate with the MgB 2 in the form of the Mg 2 Si. 6 This letter presents a process of the MgB 2 superconducting film preparation which avoids the most of the obstacles mentioned above.…”

Surface-interface exploration of Mg deposited on Si(100) and oxidation effect on interfacial layer

“…Note the great interest of thin silicide properties as Mg 2 Si for thermoelectric applications 19 or MgB 2 superconducting thin films on Si(100). 20 Here, the choice of Mg is motivated by the high potentiality of its oxide as an insulating barrier for magnetic tunnel junctions 21,22 and siliconbased spintronics. 2 All experiments were performed in an ultra-high vacuum (UHV) chamber equipped with a commercial Omicron variable temperature-scanning tunneling microscopy, an Omicron Spectra-low energy electron diffraction (LEED), and a Riber CMA Auger spectrometer.…”

Ion beam synthesis of superconducting MgB2 thin films

“…So far various thin film preparation methods have been explored in many different laboratories, such as pulsed laser deposition, 5 coevaporation, 6 Mg diffusion, 7 and molecular beam epitaxy growth 8 with various substrates. A serious common problem encountered with MgB 2 thin film fabrication is the high postdeposition annealing temperature employed for producing high T c superconducting thin films, normally in between 600 and 950°C.…”