Abstract
The long-range spin-triplet supercurrent transport is an interesting phenomenon in the superconductor/ferromagnet () heterostructure containing noncollinear magnetic domains. Here we study the long-range superharmonic Josephson current in asymmetric junctions. It is demonstrated that this current is induced by spin-triplet pairs − or + in the thick layer. The magnetic rotation of the particularly thin layer will not only modulate the amplitude of the superharmonic current but also realise the conversion between − and + . Moreover, the critical current shows an oscillatory dependence on thickness and exchange field in the layer. These effect can be used for engineering cryoelectronic devices manipulating the superharmonic current. In contrast, the critical current declines monotonically with increasing exchange field of the layer, and if the layer is converted into half-metal, the long-range supercurrent is prohibited but still exists within the entire region. This phenomenon contradicts the conventional wisdom and indicates the occurrence of spin and charge separation in present junction, which could lead to useful spintronics devices.
Highlights
Superconductor/ferromagnet (S/F) hybrid structure has recently attracted considerable attention because of the potential applications in spintronics and quantum information[1,2,3] as well as the display of a variety of unusual physical phenomena[4,5,6,7]
It is worth to point that, if the central F layer is converted into fully spin-polarized half-metal, in which electronic bands exhibit insulating behavior for one spin direction and metallic behavior for the other, the normal Andreev reflection will be inhibited completely due to inability to form a pair in the S and impossibility of single-particle transmission
Different from the configurations mentioned above, it has proposed a long-range proximity effect develops in highly asymmetric S/F1/F2/S junction composed of thick F1 layer and thin F2 layer with noncollinear magnetizations at low temperatures[22,23,24]
Summary
Superconductor/ferromagnet (S/F) hybrid structure has recently attracted considerable attention because of the potential applications in spintronics and quantum information[1,2,3] as well as the display of a variety of unusual physical phenomena[4,5,6,7]. It is high desirable to clarify the effect of the misorientation angle on the triplet pairing correlations in the S/F1/F2/S junction, as well as the influence of the thickness and the exchange field in two ferromagnetic layers on the Josephson current and the long-range spin-triplet correlations. We study the relation between the long-range superharmonic Josephson current and the spin-triplet pairing correlations in S/F1/F2/S junction.
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