In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting the 0 or π ground state.
Long-Range triplet Josephson Current Modulated by the Interface Magnetization Texture
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We have investigated the Josephson coupling between two s-wave superconductors separated by the ferromagnetic trilayers with noncollinear magnetization. We find that the long-range triplet critical current will oscillate with the strength of the exchange field and the thickness of the interface layer, when the interface magnetizations are orthogonal to the central magnetization. This feature is induced by the spatial oscillations of the spin-triplet state |\uparrow\downarrow>+|\downarrow\uparrow> in the interface layer. Moreover, the critical current can exhibit a characteristic nonmonotonic behavior, when the misalignment angle between interface magnetization and central ferromagnet increases from 0 to \pi/2. This peculiar behavior will take place under the condition that the original state of the junction with the parallel magnetizations is the \pi state.
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cond-mat.supr-con 1years
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Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers
In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting the 0 or π ground state.