Preparation and Properties of MgB2 Thin Films

Tatiana A. Prikhna, Michael Eisterer, Anton V. Shaternik, Volodymyr E. Shaternik, Paul Seidel, Vladimir Sokolovsky, Viktor E. Moshchil, Andrii P. Shapovalov, Vitaliy V. Romaka, Valeriy V. Kovylaev, Semyon S. Ponomaryov

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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 JC = 1.8 × 107 /cm2 at 10 K, JC = 8 × 106 /m 2 at 20 K in a zero magnetic field B, and JC = 3 × 106 /m2 at 10 K and B = 5 T. The values of the upper critical magnetic field Bc2 and the irreversibility field Birr estimated using the four-probe technique were BC2(22 K) = 15 T when Hfilm surface, 11 T when Ḣfilm surface, and Birr(22 K) = 11 T when Hfilm surface. The X-ray study showed that the microstructure of the film contains only MgB2 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 TC. The characteristics of superconducting magnesium diboride films make them promising for application in electronic devices, e.g., as high-pass filters.

Original languageEnglish
Article number7501507
JournalIEEE Transactions on Applied Superconductivity
Volume28
Issue number7
DOIs
StatePublished - 1 Oct 2018

Keywords

  • Critical current density
  • field of irreversibility
  • superconducting thin films
  • upper critical field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Preparation and Properties of MgB2 Thin Films'. Together they form a unique fingerprint.

Cite this