• Pinning enhancement in MgB2 superconducting thin films by magnetic nanoparticles of Fe2O3

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/036/06/0961-0966

• # Keywords

MgB2 thin film; Fe2O3 nanoparticles; critical current density; 𝑟-plane Al2O3 substrate.

• # Abstract

MgB2 thin films were fabricated on 𝑟-plane Al2O3 (1$\bar{1}$02) substrates. First, deposition of boron was performed by rf magnetron sputtering on Al2O3 substrates and followed by a post-deposition annealing at 850 °C in magnesium vapour. In order to investigate the effect of Fe2O3 nanoparticles on the structural and magnetic properties of films, MgB2 films were coated with different concentrations of Fe2O3 nanoparticles by spin coating process. The magnetic field dependence of the critical current density 𝐽c was calculated from the M–H loops and magnetic field dependence of the pinning force density, 𝑓p(𝑏), was investigated for the films containing different concentrations of Fe2O3 nanoparticles. The critical current densities, 𝐽c, in 3Tmagnetic field at 5 K were found to be around 2.7 × 104 A/cm2, 4.3 × 104 A/cm2, 1.3 × 105 A/cm2 and 5.2 × 104 A/cm2 for films with concentrations of 0, 25, 50 and 100% Fe2O3, respectively. It was found that the films coated with Fe2O3 nanoparticles have significantly enhanced the critical current density. It can be noted that especially the films coated by Fe2O3 became stronger in the magnetic field and at higher temperatures. It was believed that coated films indicated the presence of artificial pinning centres created by Fe2O3 nanoparticles. The results of AFM indicate that surface roughness of the films significantly decreased with increase in concentration of coating material.

• # Author Affiliations

1. Physics Department, Karadeniz Technical University, Trabzon 61080, Turkey
2. Ereğli Faculty of Education, Primary Education Department, Bülent Ecevit University, Ereğli-Zonguldak 67300, Turkey
3. Physics Department, Gazi University, Ankara 06500, Turkey
4. Institute of Electronic Engineering and Industrial Technologies ASM, MD2028, Chisinau, Republic of Moldovac

• # Bulletin of Materials Science

Volume 43, 2020
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019