Spontaneous vortex phases in superconductor-ferromagnet Pb-Co nanocomposite films

被引：17
|
作者：
Xing, Y. T. [1 ]
Micklitz, H. [1 ]
Rappoport, T. G. [2 ]
Milosevic, M. V. [3 ]
Solorzano-Naranjo, I. G. [4 ]
Baggio-Saitovitch, E. [1 ]
机构：
[1] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil
[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil
[3] Univ Antwerp, Dept Fys, B-2020 Antwerp, Belgium
[4] Pontificia Univ Catolica Rio de Janeiro, DCMM, BR-22453970 Rio De Janeiro, Brazil
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 22期
关键词：
ferromagnetic materials; flux pinning; magnetic particles; magnetic transitions; nanocomposites; nanoparticles; superconducting thin films; superconducting transitions;
D O I：
10.1103/PhysRevB.78.224524
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report measurements which indicate the appearance of spontaneous vortices in lead superconducting films with embedded magnetic nanoparticles and a temperature-induced phase transition between different vortex phases. Unlike common vortices in superconductors, the vortex phase appears in the absence of applied magnetic field. The vortices nucleate exclusively due to the stray field of the magnetic nanoparticles, which serve the dual role of providing the internal field and simultaneously acting as pinning centers. Transport measurements reveal dynamical phase transitions that depend on temperature (T) and applied field (H) and support the obtained H-T phase diagram.
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页数：5
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