Spin-flipping with Holmium: case study of proximity effect in superconductor/ferromagnet/superconductor heterostructures

Spin-flipping with Holmium: case study of proximity effect in superconductor/ferromagnet/superconductor heterostructures
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钬自旋翻转:超导体/铁磁体/超导体异质结构中邻近效应的案例研究

DOI:
10.1080/14786435.2014.969350
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发表时间:
2014
影响因子:
1.6
通讯作者:
Fritsch D
Fritsch D
中科院分区:
材料科学3区
文献类型:
--
作者:
Fritsch D

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超导体/铁磁/超导体异质结呈现出所谓的长程邻近效应,前提是在相应的界面区包含若干层锥形磁体Ho(Ho)。Ho层导致界面处的自旋翻转过程,在铁磁体中产生等自旋三重态配对关联。这些等自旋三重态配对关联比没有Ho时的自旋单重态和不等自旋三重态关联更深入到异质结构中。在这里,我们给出了基于自旋相关的微观Bogoliubov de Gennes方程的计算,该方程是在紧束缚模型中在清洁极限下求解的。得到了铁磁层和锥磁层厚度对诱导等自旋三重态关联的影响,并与已有的实验数据进行了比较。结果表明,与实验一致的是,为了观测到相当数量的等自旋三重态配对关联,必须存在一个临界最小锥形磁层厚度。
Superconductor/ferromagnet/superconductor heterostructures exhibit a so-called long-range proximity effect, provided some layers of conical magnet Holmium (Ho) are included in the respective interface regions. The Ho layers lead to a spin-flip process at the interface, generating equal-spin spin-triplet pairing correlations in the ferromagnet. These equal-spin spin-triplet pairing correlations penetrate much further into the heterostructure compared with the spin-singlet and unequal-spin spin-triplet correlations which occur in the absence of Ho. Here, we present calculations of this effect based on the spin-dependent microscopic Bogoliubov de Gennes equations solved within a tight-binding model in the clean limit. The influence of the ferromagnet and conical magnet layer thickness on the induced equal-spin spin-triplet pairing correlations is obtained and compared to available experimental data. It is shown that, in agreement with the experiment, a critical minimum thickness of conical magnet layers has to be present in order to observe a sizeable amount of equal-spin spin-triplet pairing correlations.
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影响因子: 3.7
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