Enhancing Superconducting Properties of MgB2 by Addition of Magnetic Particles
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Main results of ongoing comprehensive study of the influence of magnetic nanoparticles (MNP) on superconducting properties (transition temperature T c, critical fields and critical current density, J c, etc.) of high-quality Fe-sheathed MgB2 wires are briefly reviewed. We prepared over 60 Fe-sheathed MgB2 wires doped with 12 different types and quantities of MNPs, such as elemental magnets, magnetic borides, ferrites, and rare earth borides. Generally, doping with MNPs suppresses T c and higher MNP contents cause deterioration of superconducting properties of wires. However, light doping (≤ 2.5 wt%) with some types of MNPs (e.g., Ni) improved flux pinning and in-field J c of wires. Particularly promising seems co-doping with core-shell MNPs, where both critical fields and J c were simultaneously enhanced. Possible origins of these improvements (such as magnetic flux pinning) are briefly discussed.
KeywordsMgB2 wires Magnetic nanoparticle doping Flux pinning
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