All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Abstract

Angular momentum transport is one of the cornerstones of spintronics. Spin angular momentum is not only transported by mobile charge carriers, but also by the quantized excitations of the magnetic lattice in magnetically ordered systems. In this regard, magnetically ordered insulators provide a platform for magnon spin transport experiments without additional contributions from spin currents carried by mobile electrons. In combination with charge-to-spin current conversion processes in conductors with finite spin-orbit coupling it is possible to realize all-electrical magnon transport schemes in thin film heterostructures. This review provides an insight into such experiments and recent breakthroughs achieved. Special attention is given to charge current based manipulation via an adjacent normal metal of magnon transport in magnetically ordered insulators in terms of spin-transfer torque. Moreover, the influence of two magnon modes with opposite spin in antiferromagnetic insulators on all-electrical magnon transport experiments is discussed.

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• Magnon transport in ${\mathbf{Y}}_3\mathbf{F}{\mathbf{e}}_5{\mathbf{O}}_{12}$/Pt nanostructures with reduced effective magnetization
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
• Impact of magnetic anisotropy on the magnon Hanle effect in $\alpha$-Fe${}_2$O${}_3$
• Magnonic spin Joule heating and rectification effects
• Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets
• Theory of nonlinear magnetoelectric transport effects in normal-metal $-$ magnetic-insulator heterostructures