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 (MOIs) 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. Herein, an insight into such experiments and recent breakthroughs achieved is provided. Special attention is given to charge‐current‐based manipulation via an adjacent normal metal of magnon transport in MOIs 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.

Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids

“…The electrically-driven magnon flows in YIG, and is finally converted into an ISHE voltage at the detector strip. This all-electrical magnon transport has also been investigated intensively, and recent progress is summarized in Reference (118).…”

Thermal effects in spintronic materials and devices: An experimentalist’s guide

“…Important topics (of which I am aware) that I have not been able to cover include spin Hall magnetoresistance, [252][253][254] 2D materials [255][256][257], the entire field of heat assisted magnetic recording (HAMR), [258][259][260], thermally driven neuromorphic computing devices, [261] magnon effects in metallic systems, [262][263][264][265][266] phase change memory, [267] novel use of ANE and SSE for imaging spintronic materials, [248,268] and the important role of thermally driven effects in non-local spin transport in magnetic insulators. [269] I have also limited my consideration to essentially dc effects, and have ignored a large body of fascinating and important research on thermal effects on ultrafast timescales, [270][271][272] including important and illuminating work on the spin Seebeck effect on pico-and femtosecond timescales. [273,274] I am certain I have missed other topics.…”

Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect

“…In ultra-low damping materials, a 0.1% variation from the thermal occupation is usually sufficient to drive the magnetization dynamics into the nonlinear regime [13]. These effect could be exploited for spin diodes [11,14], spin amplifier [15][16][17] or spin rectifier of microwave signals [18][19][20][21][22].…”