期刊
ADVANCED MATERIALS
卷 33, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202008555
关键词
coherent spin wave transport; magnetic insulators; magnon spin current; resonant spin transmission
类别
资金
- AFOSR [FA9550-19-1-0048]
- National Science Foundation [ECCS-1808826]
- SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program - National Institute of Standards and Technology (NIST)
- National Research Council Research Associateship Program
The research demonstrates that coherent magnons can efficiently transfer spins above the magnon bandgap of magnetic insulators, with the standing spin-wave mode greatly enhancing spin flow. In contrast, a shutdown of spin transmission is observed within the magnon bandgap due to the blocking of coherent magnons.
While being electrically insulating, magnetic insulators can behave as good spin conductors by carrying spin current with excited spin waves. So far, magnetic insulators are utilized in multilayer heterostructures for optimizing spin transport or to form magnon spin valves for reaching controls over the spin flow. In these studies, it remains an intensively visited topic as to what the corresponding roles of coherent and incoherent magnons are in the spin transmission. Meanwhile, understanding the underlying mechanism associated with spin transmission in insulators can help to identify new mechanisms that can further improve the spin transport efficiency. Here, by studying spin transport in a magnetic-metal/magnetic-insulator/platinum multilayer, it is demonstrated that coherent magnons can transfer spins efficiently above the magnon bandgap of magnetic insulators. Particularly the standing spin-wave mode can greatly enhance the spin flow by inducing a resonant magnon transmission. Furthermore, within the magnon bandgap, a shutdown of spin transmission due to the blocking of coherent magnons is observed. The demonstrated magnon transmission enhancement and filtering effect provides an efficient method for modulating spin current in magnonic devices.
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