Naslov
Magnetic nanoparticles in MgB2: vortex pinning, pair breaking and connectivity

Autori
Babić, Emil ; Novosel, Nikolina ; Pajić, Damir ; Galić, Stipe ; Zadro, Krešo ; Drobac, Đuro

Izvornik
Journal of magnetism and magnetic materials (0304-8853) 400 (2016); 88-92

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
MgB2 wires ; magnetic nanoparticle doping ; flux pinning

Sažetak
The results indicating magnetic flux pinning in MgB2 wires doped with three types of magnetic nanoparticles (MNP) are reported. The magnetic state of MNPs, both as-prepared and inside the MgB2 core was determined with magnetization and ac susceptibility measurements. The competition between detrimental influence of doping (reduced connectivity, pair breaking) and enhanced flux pinning leads to deterioration of electromagnetic properties of doped wires at high MNP content, whereas light doping causes an enhancement of critical current density, Jc, and/or irreversibility field, Birr, for all our MNPs. For Ni and dextrin coated NiFe2O4 MNPs the enhancement of Jc was comparable to that achieved with the best nonmagnetic dopands. Detailed analysis indicates the contribution of magnetic flux pinning including the matching effects in flux pinning on MNPs.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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