The effects of magnetization switching on the superconducting properties of S / F bilayers and F / S / F trilayers
The effects of magnetization switching on the superconducting properties of S / F bilayers and F / S / F trilayers
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磁化强度翻转对S/F双层和F/S/F三层超导性能的影响
DOI：
10.1016/j.crhy.2005.12.005
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
A. Rusanov
中科院分区：
文献类型：
--
作者：
J. Aarts;A. Rusanov
本文讨论了超导体（S）/铁磁体（F）混合体中F层磁化不均匀或不同F层磁化方向不平行时实验发现的不同效应。在由Nb和坡莫合金（Py）组成的双层膜中，我们发现在Py层的矫顽场Hco处超导转变的电阻降低，这归因于畴壁的作用。在Cu_（0.46）Ni_（0.54）/Nb/Cu_（0.46）Ni_（0.54）三层中，我们发现在Hco附近超导态的退配对电流增加，这可能也是由于畴壁的作用。然而，在三层的Py/Nb/Py，我们发现，除了从个别层的畴壁效应，一个强烈的增加的电阻在过渡时，两个Py层的磁化方向被切换到一个反平行的几何形状。我们把这归因于自旋极化准粒子的存在。引用这篇文章：J. Aarts，A.Yu.鲁萨诺夫角R. Physique 7（2006）.
We discuss different effects which are experimentally found in superconductor (S)/ferromagnet (F) hybrids when the magnetization of the F-layers is inhomogeneous, or when the magnetization directions in different F-layers are not parallel. In bilayers consisting of Nb and Permalloy (Py), we find a lowering of the resistance in the superconducting transition at the coercive field Hcoof the Py layer, which we attribute to the effects of domain walls. In trilayers of Cu0.46Ni0.54/Nb/Cu0.46Ni0.54we find an increase of the depairing current in the superconducting state around Hco, which is probably also due to domain walls. In trilayers of Py/Nb/Py, however, we find, besides domain wall effects from individual layers, a strong increase of the resistance in the transition when the magnetization directions of the two Py layers are switched to an antiparallel geometry. We ascribe this to the presence of spin-polarized quasiparticles. To cite this article: J. Aarts, A.Yu. Rusanov, C. R. Physique 7 (2006).