Long-range spin-polarized Josephson effect in ballistic S/F/S junctions with precessing magnetization
E. S. Andriyakhina, M. Mansouri, M. Breitkreiz, P. W. Brouwer
TLDR
This paper theorizes a long-range spin-polarized Josephson effect in S/F/S junctions with precessing magnetization, enabling an "off" to "on" switch.
Key contributions
- Develops a theory for ballistic S/F/S junctions with uniformly precessing magnetization.
- Shows precessing magnetization generates long-range equal-spin superconducting correlations.
- Predicts non-sinusoidal current-phase relationships due to non-equilibrium Andreev states.
- Demonstrates an "off" to "on" switching effect in half-metal junctions via precession.
Why it matters
This work significantly advances the understanding of spin-polarized superconductivity and its dynamic control. It introduces a novel mechanism for switching superconducting junctions, which could be crucial for developing future spintronic devices.
Original Abstract
We present a theory of ballistic N/F/S and S/F/S junctions with a uniformly precessing magnetization, which generates long-range equal-spin superconducting correlations [Takahashi et al., Phys. Rev. Lett. 99, 057003 (2007), Houzet, Phys. Rev. Lett. 101, 057009 (2008)]. The non-equilibrium distribution of Andreev bound states leads to a strongly non-sinusoidal current-phase relationship for large precession angles. We derive detailed results for ballistic junctions involving partially and fully polarized ferromagnets. In the fully polarized half-metal limit, the magnetization precession switches the junction from an "off" state with vanishing subgap current to an "on" state with finite Andreev conductance and finite Josephson current.
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