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Pure spin currents, i.e. the transport of angular momentum without anaccompanying charge current, represent a new, promising avenue in modernspintronics from both a fundamental and an application point of view. Such purespin currents can not only flow in electrical conductors via mobile chargecarriers, but also in magnetically ordered electrical insulators as a flow ofspin excitation quanta. Over the course of the last years remarkable resultshave been obtained in heterostructures consisting of magnetically orderedinsulators interfaced with a normal metal, where a pure spin current flowsacross the interface. This topical review article deals with the fundamentalprinciples, experimental findings and recent developments in the field of purespin currents in magnetically ordered insulators. We here put our focus ontofour different manifestations of pure spin currents in such heterostructures:The spin pumping effect, the longitudinal spin Seebeck effect, the spin Hallmagnetoresistance and the all-electrical detection of magnon transport innon-local device concepts. In this article, we utilize a common theoreticalframework to explain all four effects and explain important material systems(especially rare-earth iron garnets) used in the experiments. For each effectwe introduce basic measurement techniques and detection schemes and discusstheir application in the experiment. We account for the remarkable progressachieved in each field by reporting the recent progress in each field and bydiscussing research highlights obtained in our group. Finally, we conclude thereview article with an outlook on future challenges and obstacles in the fieldof pure spin currents in magnetically ordered insulator / normal metalheterostructures.

Pure spin currents in magnetically ordered insulator/normal metal heterostructures