Pure spin currents in magnetically ordered insulator/normal metal heterostructures

Abstract

Pure spin currents, i.e. the transport of angular momentum without an accompanying charge current, represent a new, promising avenue in modern spintronics from both a fundamental and an application point of view. Such pure spin currents can not only flow in electrical conductors via mobile charge carriers, but also in magnetically ordered electrical insulators as a flow of spin excitation quanta. Over the course of the last years remarkable results have been obtained in heterostructures consisting of magnetically ordered insulators interfaced with a normal metal, where a pure spin current flows across the interface. This topical review article deals with the fundamental principles, experimental findings and recent developments in the field of pure spin currents in magnetically ordered insulators. We here put our focus onto four different manifestations of pure spin currents in such heterostructures: The spin pumping effect, the longitudinal spin Seebeck effect, the spin Hall magnetoresistance and the all-electrical detection of magnon transport in non-local device concepts. In this article, we utilize a common theoretical framework to explain all four effects and explain important material systems (especially rare-earth iron garnets) used in the experiments. For each effect we introduce basic measurement techniques and detection schemes and discuss their application in the experiment. We account for the remarkable progress achieved in each field by reporting the recent progress in each field and by discussing research highlights obtained in our group. Finally, we conclude the review article with an outlook on future challenges and obstacles in the field of pure spin currents in magnetically ordered insulator / normal metal heterostructures.

Topical Review Article on pure spin currents in magnetically ordered insulators. Please contact me via email, if you have any suggestions/critique

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Cited by in corpus (27)

• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect
• Spin transport in a magnetic insulator with zero effective damping
• Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
• Spin and spin current -- From fundamentals to recent progress
• Spin Hall magnetoresistance in antiferromagnetic insulators
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• Antiferromagnetic magnon pseudospin: Dynamics and diffusive transport
• Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport
• Spin-Hall magnetoresistance in a low-dimensional magnetic insulator
• Enhanced spin-orbit coupling in a heavy metal via molecular coupling
• Quantifying the spin mixing conductance of EuO/W heterostructures by spin Hall magnetoresistance experiments
• Current direction anisotropy of the spin Hall magnetoresistance in nickel ferrite thin films with bulk-like magnetic properties
• Local and nonlocal spin Seebeck effect in lateral Pt-$\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$-Pt devices at low temperatures
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Cross-sublattice Spin Pumping and Magnon Level Attraction in van der Waals Antiferromagnets
• Magnon transport in ${\mathbf{Y}}_3\mathbf{F}{\mathbf{e}}_5{\mathbf{O}}_{12}$/Pt nanostructures with reduced effective magnetization
• Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device
• Acousto-magnonic spin Hall effect in honeycomb antiferromagnets
• Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Quantitative comparison of magnon transport experiments in three-terminal YIG/Pt nanostructures acquired via dc and ac detection techniques
• Detection of the interfacial exchange field at a ferromagnetic insulator-nonmagnetic metal interface with pure spin currents
• Comparison of spin-wave transmission in parallel and antiparallel magnetic configurations
• Magnonic spin Joule heating and rectification effects
• Symmetry-driven Intrinsic Nonlinear Pure Spin Hall Effect
• Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets