Observation of Pinning Strengthening in “MgB₂ – CNT – α-Fe” Nanocomposites Studied by Microwave Absorption Technique

Abstract

Microwave absorption histeresis is measured in superconducting composites, prepared from MgB2 , carbon nanotubes, graphene particles and iron nanoparticles. Iron nanoparticles were synthesized with using of isopropanol in the supercritical fluid state. Measurements showed that the greatest increase in the pinning force is observed in the “MgB2 – (CNT-α-Fe)” composite.