Magnetic nanoparticles in MgB2: Vortex pinning, pair breaking and connectivity

被引：10
作者：
Babic, Emil [1 ]
Novosel, Nikolina [1 ]
Pajic, Damir [1 ]
Galic, Stipe [1 ]
Zadro, Kreso [1 ]
Drobac, Duro [2 ]
机构：
[1] Univ Zagreb, Fac Sci, Dept Phys, HR-10000 Zagreb, Croatia
[2] Inst Phys, HR-10000 Zagreb, Croatia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2016年 / 400卷
关键词：
MgB2; wires; Magnetic nanoparticle doping; Flux pinning; SUPERCONDUCTING PROPERTIES; CRITICAL CURRENTS; DENSITY; FIELDS;
D O I：
10.1016/j.jmmm.2015.08.048
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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, J(c), and/or irreversibility field, B-irr, for all our MNPs. For Ni and dextrin coated NiFe2O4 MNPs the enhancement of J(c) 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. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：88 / 92
页数：5
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