Josephson Currents and Spin Transfer Torques in Ballistic SFSFS Nanojunctions

Abstract

Utilizing a full microscopic Bogoliubov-de Gennes (BdG) approach, we study the equilibrium charge and spin currents in ballistic $SFSFS$ Josephson systems, where $F$ is a uniformly magnetized ferromagnet and $S$ is a conventional $s$-wave superconductor. From the spatially varying spin currents, we also calculate the associated equilibrium spin transfer torques. Through variations in the relative phase differences between the three $S$ regions, and magnetization orientations of the ferromagnets, our study demonstrates tunability and controllability of the spin and charge supercurrents. The spin transfer torques are shown to reveal details of the proximity effects that play a crucial role in these types of hybrid systems. The proposed $SFSFS$ nanostructure is discussed within the context of a superconducting magnetic torque transistor.

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• Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F$|$NCSC$|$F spin valve
• Charge and Spin Supercurrents in Magnetic Josephson Junctions with Spin Filters and Domain Walls
• Phase-controlled spin and charge currents in superconductor-ferromagnet hybrids
• Dissipationless Spin-Charge Conversion in Excitonic Pseudospin Superfluid
• Proximity effect and p-wave superconductivity in s-wave superconductor/helimagnet heterostructures
• Signatures of Long-Range Spin-Triplet Component in Andreev Interferometer
• Spin flip scattering engendered quantum spin torque in a Josephson junction
• Triplet correlations in superconductor/antiferromagnet heterostructures: dependence on type of antiferromagnetic ordering
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures