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Charge and Spin Currents in Ferromagnetic Josephson junctions
Superconductivity · Submitted 17 Jun 2015
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim By manipulating the relative $F$ layer magnetization orientations, we find that the charge supercurrent can reverse directions or vanish altogether.
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The abstract, sentence by sentence
We determine, using a self consistent method, the charge and spin currents in ballistic Josephson junctions consisting of ferromagnetic ($F$) layers sandwiched between superconducting ($S$) electrodes ($SFS$-type junctions). When there are two $F$ layers, we also consider the experimentally relevant configuration where a normal ($N$) nonmagnetic spacer layer separates them. We study the current-phase relationships as functions of geometrical parameters that are accessible experimentally including the angles that characterize the relative orientation of the magnetization in the $F$ layers. Our self-consistent method ensures that the proper charge conservation laws are satisfied. As we vary the phase difference $\Delta\varphi$ between the two outer $S$ electrodes, multiple harmonics in the current phase relations emerge, their extent depends on the interface scattering strength and the relative $F$ layer widths and magnetization orientations. By manipulating the relative $F$ layer magnetization orientations, we find that the charge supercurrent can reverse directions or vanish altogether. These findings are discussed in the context of the generation and long-range nature of triplet pair correlation. We also investigate the spin currents and associated spin transfer torques throughout the junction. For noncollinear relative magnetizations, the non-conserved spin currents in a given $F$ region gives rise to net torques that can switch directions at particular magnetic configurations or $\Delta\varphi$ values. The details of the spin current behavior are shown to depend strongly on the degree of magnetic inhomogeneity in the system.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We determine, using a self consistent method, the charge and spin currents in ballistic Josephson junctions consisting of ferromagnetic ($F$) layers sandwiched between superconducting ($S$) electrodes ($SFS$-type junctions). | contribution 1.00 | 0.96 | 0.06 | asserted 1.00 |
| s1 | When there are two $F$ layers, we also consider the experimentally relevant configuration where a normal ($N$) nonmagnetic spacer layer separates them. | contribution 0.92 | 0.55 | 0.02 | asserted 0.91 |
| s2 | We study the current-phase relationships as functions of geometrical parameters that are accessible experimentally including the angles that characterize the relative orientation of the magnetization in the $F$ layers. | contribution 0.92 | 0.93 | 0.04 | asserted 0.98 |
| s3 | Our self-consistent method ensures that the proper charge conservation laws are satisfied. | method 0.94 | 0.82 | 0.03 | asserted 1.00 |
| s4 | As we vary the phase difference $\Delta\varphi$ between the two outer $S$ electrodes, multiple harmonics in the current phase relations emerge, their extent depends on the interface scattering strength and the relative $F$ layer widths and magnetization orientations. | result 1.00 | 0.94 | 0.12 | asserted 1.00 |
| s5 | By manipulating the relative $F$ layer magnetization orientations, we find that the charge supercurrent can reverse directions or vanish altogether. | result 1.00 | 0.96 | 0.34 | asserted 0.99 |
| s6 | These findings are discussed in the context of the generation and long-range nature of triplet pair correlation. | interpretation 1.00 | 0.39 | 0.10 | unclear 0.51 |
| s7 | We also investigate the spin currents and associated spin transfer torques throughout the junction. | contribution 1.00 | 0.95 | 0.05 | asserted 0.90 |
| s8 | For noncollinear relative magnetizations, the non-conserved spin currents in a given $F$ region gives rise to net torques that can switch directions at particular magnetic configurations or $\Delta\varphi$ values. | result 0.99 | 0.88 | 0.11 | asserted 0.99 |
| s9 | The details of the spin current behavior are shown to depend strongly on the degree of magnetic inhomogeneity in the system. | result 0.99 | 0.90 | 0.08 | asserted 1.00 |
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Original abstract
We determine, using a self consistent method, the charge and spin currents in ballistic Josephson junctions consisting of ferromagnetic ($F$) layers sandwiched between superconducting ($S$) electrodes ($SFS$-type junctions). When there are two $F$ layers, we also consider the experimentally relevant configuration where a normal ($N$) nonmagnetic spacer layer separates them. We study the current-phase relationships as functions of geometrical parameters that are accessible experimentally including the angles that characterize the relative orientation of the magnetization in the $F$ layers. Our self-consistent method ensures that the proper charge conservation laws are satisfied. As we vary the phase difference $\Delta\varphi$ between the two outer $S$ electrodes, multiple harmonics in the current phase relations emerge, their extent depends on the interface scattering strength and the relative $F$ layer widths and magnetization orientations. By manipulating the relative $F$ layer magnetization orientations, we find that the charge supercurrent can reverse directions or vanish altogether. These findings are discussed in the context of the generation and long-range nature of triplet pair correlation. We also investigate the spin currents and associated spin transfer torques throughout the junction. For noncollinear relative magnetizations, the non-conserved spin currents in a given $F$ region gives rise to net torques that can switch directions at particular magnetic configurations or $\Delta\varphi$ values. The details of the spin current behavior are shown to depend strongly on the degree of magnetic inhomogeneity in the system.
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A microscopic theory of the LRTC for this quasiballistic case has been presented in Ref. [ref] .] Since the discovery of the long range triplet odd frequency components $f_tr,±1$, the idea of the penetration of superconductivity through strong ferromagnets has been discussed in numerous publications (see Refs. [ref] , the reviews Refs. [ref] as well as the recent works Refs. [ref] and references therein).
Nematic versus ferromagnetic spin filtering of triplet Cooper pairs in superconducting spintronics · Introduction · 0.87
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