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Magnon mode selective spin transport in compensated ferrimagnets

Journal Article · · Nano Letters
 [1];  [2];  [3];  [4];  [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)
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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Cited By (18)

Spin current from sub-terahertz-generated antiferromagnetic magnons journal January 2020
Magnetic and optical property studies on cubic Gd 3 Fe 5−x Co x O 12 nanogarnets for spintronics journal January 2018
Antiferromagnetic NiO thickness dependent sign of the spin Hall magnetoresistance in γ-Fe 2 O 3 /NiO/Pt epitaxial stacks journal March 2019
Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport journal October 2019
Absence of evidence of spin transport through amorphous Y 3 Fe 5 O 12 journal January 2020
Spin transport across antiferromagnets induced by the spin Seebeck effect journal March 2018
Lock-in thermography measurements of the spin Peltier effect in a compensated ferrimagnet and its comparison to the spin Seebeck effect journal April 2018
Pure spin currents in magnetically ordered insulator/normal metal heterostructures journal July 2018
Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets journal October 2018
Gilbert damping phenomenology for two-sublattice magnets journal November 2018
Spin Pumping and Shot Noise in Ferrimagnets: Bridging Ferro- and Antiferromagnets journal November 2017
Spin Splitting Induced in a Superconductor by an Antiferromagnetic Insulator journal December 2018
Strongly extended diffusion length for the nonequilibrium magnons in Y 3 F e 5 O 12 by photoexcitation journal May 2018
Spin transport across antiferromagnets induced by the spin Seebeck effect text January 2018
Spin transport across antiferromagnets induced by the spin Seebeck effect text January 2018
Synthetic antiferromagnetic coupling between ultra-thin insulating garnets text January 2018
Spin splitting induced in a superconductor by an antiferromagnetic insulator text January 2018
Absence of evidence of spin transport through amorphous Y$_3$Fe$_5$O$_{12}$ text January 2019

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