skip to main content

DOE PAGESDOE PAGES

Title: Magnon mode selective spin transport in compensated ferrimagnets

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.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [6] ;  [3] ;  [6] ;  [7] ;  [7] ;  [8] ;  [1] ;  [9]
  1. Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Graduate School of Excellence Materials Science in Mainz, Mainz (Germany)
  2. Johannes Gutenberg-Univ. Mainz, Mainz (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Walther-MeiBner-Institut, Garching (Germany)
  4. Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
  5. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia); Austrian Academy of Sciences, Leoben (Austria); Far Eastern Federal Univ., Vladivostok (Russia)
  6. Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
  7. Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany); Nanosystems Initiative Munich (NIM), Munchen (Germany)
  8. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  9. Walther-MeiBner-Institut, Garching (Germany); Technische Univ. Munchen, Garching (Germany); Nanosystems Initiative Munich (NIM), Munchen (Germany); Technische Univ. Dresden, Dresden (Germany)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 6; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; magnon transportation; compensated ferrimagnet; magnon coupling; spin current; spin seebeck effect
OSTI Identifier:
1366414

Cramer, Joel, Guo, Er -Jia, Geprags, Stephan, Kehlberger, Andreas, Ivanov, Yurii P., Ganzhorn, Kathrin, Coletta, Francesco Della, Althammer, Matthias, Huebl, Hans, Gross, Rudolf, Kosel, Jurgen, Klaui, Mathias, and Goennenwein, Sebastian T. B.. Magnon mode selective spin transport in compensated ferrimagnets. United States: N. p., Web. doi:10.1021/acs.nanolett.6b04522.
Cramer, Joel, Guo, Er -Jia, Geprags, Stephan, Kehlberger, Andreas, Ivanov, Yurii P., Ganzhorn, Kathrin, Coletta, Francesco Della, Althammer, Matthias, Huebl, Hans, Gross, Rudolf, Kosel, Jurgen, Klaui, Mathias, & Goennenwein, Sebastian T. B.. Magnon mode selective spin transport in compensated ferrimagnets. United States. doi:10.1021/acs.nanolett.6b04522.
Cramer, Joel, Guo, Er -Jia, Geprags, Stephan, Kehlberger, Andreas, Ivanov, Yurii P., Ganzhorn, Kathrin, Coletta, Francesco Della, Althammer, Matthias, Huebl, Hans, Gross, Rudolf, Kosel, Jurgen, Klaui, Mathias, and Goennenwein, Sebastian T. B.. 2017. "Magnon mode selective spin transport in compensated ferrimagnets". United States. doi:10.1021/acs.nanolett.6b04522. https://www.osti.gov/servlets/purl/1366414.
@article{osti_1366414,
title = {Magnon mode selective spin transport in compensated ferrimagnets},
author = {Cramer, Joel and Guo, Er -Jia and Geprags, Stephan and Kehlberger, Andreas and Ivanov, Yurii P. and Ganzhorn, Kathrin and Coletta, Francesco Della and Althammer, Matthias and Huebl, Hans and Gross, Rudolf and Kosel, Jurgen and Klaui, Mathias and Goennenwein, Sebastian T. B.},
abstractNote = {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.},
doi = {10.1021/acs.nanolett.6b04522},
journal = {Nano Letters},
number = 6,
volume = 17,
place = {United States},
year = {2017},
month = {4}
}