Dissipationless Spin Current between Two Coupled Ferromagnets

Abstract

We demonstrate the general principle which states that a dissipationless spin current flows between two coupled ferromagnets if their magnetic orders are misaligned. This principle applies regardless the two ferromagnets are metallic or insulating, and also generally applies to bulk magnetic insulators. On a phenomenological level, this principle is analogous to Josephson effect, and yields a dissipationless spin current that is independent from scattering. The microscopic mechanisms for the dissipationless spin current depend on the systems, which are elaborated in details. A uniform, static magnetic field is further proposed to be an efficient handle to create the misaligned configuration and stabilize the dissipationless spin current.

10 pages, 5 figures

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• Exact treatment of magnetism-driven ferroelectricity in the one-dimensional compass model
• Conservation of spin supercurrents in superconductors
• Curvature-induced long ranged supercurrents in diffusive SFS Josephson Junctions, with dynamic $0-\pi$ transition
• Monopole Josephson Effects in a Dirac Spin Liquid
• Direct and inverse superspin Hall effect in two-dimensional systems: Electrical detection of spin supercurrents
• Interaction Between a Domain Wall and Spin Supercurrent in Easy-cone Magnets
• Theory of generalized Josephson effects
• Spin Current in Junctions composed of Multi-band Superconductors with a Spin-density Wave
• Voltage control of superconducting exchange interaction and anomalous Josephson effect
• Spin current and second harmonic generation in non-collinear magnetic systems: the hydrodynamic model
• Inductance Due to Spin Current
• Tunneling between chiral magnets: Spin current generation without external fields
• Magnetoelectric torque and edge currents in spin-orbit coupled graphene nanoribbons
• Acoustic spin current generation in superconductors
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