Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet

Abstract

The supercurrent of a quantum point contact coupled to a nanomagnet strongly depends on the dynamics of the nanomagnet's spin. We employ a fully microscopic model to calculate the transport properties of a junction coupled to a spin whose dynamics is modeled as Larmor precession brought about by an external magnetic field and find that the dynamics affects the charge and spin currents by inducing transitions between the continuum states below the superconducting gap edge and the Andreev levels. This redistribution of the quasiparticles leads to a non-equilibrium population of the Andreev levels and an enhancement of the supercurrent which is visible as a modified current-phase relation as well as a non-monotonous critical current as function of temperature. The non-monotonous behavior is accompanied by a corresponding change in spin-transfer torques acting on the precessing spin and leads to the possibility of using temperature as a means to tune the back-action on the spin.

11 pages, 5 figures

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Cited by in corpus (11)

• Spin-polarized supercurrents for spintronics: a review of current progress
• Possible evidence for spin-transfer torque induced by spin-triplet supercurrent
• Resistive state of SFS Josephson junctions in the presence of moving domain walls
• Large enhancement of spin pumping due to the surface bound states in normal metal/superconductor structures
• Spin-Transfer and Exchange Torques in Ferromagnetic Superconductors
• Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection
• Spin transport and tunable Gilbert damping in a single-molecule magnet junction
• Josephson current through a quantum dot coupled to a molecular magnet
• Voltage control of superconducting exchange interaction and anomalous Josephson effect
• Andreev spectrum of a Josephson junction with spin-split superconductors
• Spin nutation effects in molecular nanomagnet$-$superconductor tunnel junctions