Magnon mode selective spin transport in compensated ferrimagnets
- Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Graduate School of Excellence Materials Science in Mainz, Mainz (Germany)
- Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Walther-MeiBner-Institut, Garching (Germany)
- Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
- King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia); Austrian Academy of Sciences, Leoben (Austria); Far Eastern Federal Univ., Vladivostok (Russia)
- Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
- Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany); Nanosystems Initiative Munich (NIM), Munchen (Germany)
- King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
- Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany); Nanosystems Initiative Munich (NIM), Munchen (Germany); Technische Univ. Dresden, Dresden (Germany)
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. As a result, 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1366414
- Journal Information:
- Nano Letters, Journal Name: Nano Letters Journal Issue: 6 Vol. 17; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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