Magnetic confinement of the superconducting condensate in superconductor-ferromagnet hybrid composites

被引:31
|
作者
Gillijns, W.
Aladyshkin, A. Yu.
Silhanek, A. V.
Moshchalkov, V. V.
机构
[1] Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism & Pulsed Field, Inst Nanoscale Phys & Chem, INPAC, B-3001 Louvain, Belgium
[2] Russian Acad Sci, Inst Phys Microstruct, Nizhnii Novgorod 603950, Russia
来源
PHYSICAL REVIEW B | 2007年 / 76卷 / 06期
关键词
D O I
10.1103/PhysRevB.76.060503
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The influence of an inhomogeneous magnetic field on the magnetoresistance of thin Al films, used in different superconductor-ferromagnet hybrids, has been investigated. Two contrasting magnetic textures with out-of-plane magnetization are explored: namely, (i) a plain film in a multidomain state and (ii) an array of microsized dots. The stray fields of the ferromagnetic structures confine the superconducting condensate and, accordingly, modify the condition for the nucleation of superconductivity. By switching between different magnetic states of the ferromagnet, this confinement can be tuned at will, thereby reversibly changing the dependence of the critical temperature T-c on an external magnetic field H. In particular, continuous evolution from a conventional linear T-c(H) dependence with a single maximum to a reentrant superconducting phase boundary with multiple T-c peaks has been demonstrated.
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页数:4
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