期刊
NANO LETTERS
卷 17, 期 6, 页码 3334-3340出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04522
关键词
Spin current; spin Seebeck effect; compensated ferrimagnet; magnon coupling
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1538]
- Graduate School of Excellence Materials Science in Mainz (MAINZ) [DFG/GSC 266]
- EU [NMP3-LA-2012246102, FP7-ICT-2013-X 612759]
- DAAD
- U.S. Department of Energy (DOE), Office of Science (OS), Basic Energy Sciences (BES)
- Laboratory Directed Research and Development (LDRD) Program of Oak Ridge National Laboratory (ORNL)
We investigate the generation of magnonic thermal spin currents and their mode selective spin transport across interfaces in insulating, compensated ferrimagnet/normal metal bilayer systems. The spin Seebeck effect signal exhibits a nonmonotonic temperature dependence with two sign changes of the detected voltage signals. Using different ferrimagnetic garnets, we demonstrate the universality of the observed complex temperature dependence of the spin Seebeck effect. To understand its origin, we systematically vary the interface between the ferrimagnetic garnet and the metallic layer, and by using different metal layers we establish that interface effects play a dominating role. They do not only modify the magnitude of the spin Seebeck effect signal but in particular also alter its temperature dependence. By varying the temperature, we can select the dominating magnon mode and we analyze our results to reveal the mode selective interface transmission probabilities for different magnon modes and interfaces. The comparison of selected systems reveals semiquantitative details of the interfacial coupling depending on the materials involved, supported by the obtained field dependence of the signal.
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