Preparation and Properties of MgB2 Thin Films

The superconducting transition temperature of 140 nm ± 10 nm thin films on sapphire substrates, which were deposited by magnetron sputtering, was around 36 K. Using a magnetization technique, the film's critical current density was estimated as J C = 1.8 × 10 7 A/cm 2 at 10 K, J C = 8 × 10 6 A/...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2018-10, Vol.28 (7), p.1-7
Main Authors: Prikhna, Tatiana A., Eisterer, Michael, Shaternik, Anton V., Shaternik, Volodymyr E., Seidel, Paul, Sokolovsky, Vladimir, Moshchil, Viktor E., Shapovalov, Andrii P., Romaka, Vitaliy V., Kovylaev, Valeriy V., Ponomaryov, Semyon S.
Format: Article
Language:English
Subjects:
Auger spectroscopy
Borides
Critical current density
Critical current density (superconductivity)
Electronic devices
field of irreversibility
High pass filters
High-temperature superconductors
Magnesium
Magnesium compounds
Magnetic fields
Magnetism
Magnetron sputtering
Oxygen content
Sapphire
Sputtering
Substrates
Superconducting filters
Superconducting magnets
Superconducting thin films
Superconductivity
Thin films
Transition temperature
upper critical field
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The superconducting transition temperature of 140 nm ± 10 nm thin films on sapphire substrates, which were deposited by magnetron sputtering, was around 36 K. Using a magnetization technique, the film's critical current density was estimated as J C = 1.8 × 10 7 A/cm 2 at 10 K, J C = 8 × 10 6 A/m 2 at 20 K in a zero magnetic field B, and J C = 3 × 10 6 A/m 2 at 10 K and B = 5 T. The values of the upper critical magnetic field B c2 and the irreversibility field B irr estimated using the four-probe technique were B C2 (22 K) = 15 T when H||film surface, 11 T when H⊥film surface, and B irr (22 K) = 11 T when H||film surface. The X-ray study showed that the microstructure of the film contains only MgB 2 and MgO (in minority). The SEM and EPXMA study and quantitative Auger spectroscopy analysis revealed periodical variations of the film composition on the nanolevel and the presence of (mainly) two intercalated Mg-B-O-C phases of slightly different, especially in oxygen content, and thus with different conductivity and, possibly, with different T C . The characteristics of superconducting magnesium diboride films make them promising for application in electronic devices, e.g., as high-pass filters.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2844357