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Title: Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states

Abstract

Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demonstrate this property using the spin Seebeck effect (SSE), that is, measuring the transverse thermoelectric response to a temperature gradient across a thin film of yttrium iron garnet, an insulating ferrimagnet, and forming a heterojunction with (BixSb1–x)2Te3, a topological insulator. The non-equilibrium magnon population established at the interface can decay in part by interactions of magnons with electrons near the Fermi energy of the topological insulator. When this decay channel is made active by tuning (BixSb1–x)2Te3 into a bulk insulator, a large electromotive force emerges in the direction perpendicular to the in-plane magnetization of yttrium iron garnet. Lastly, the enhanced, tunable SSE which occurs when the Fermi level lies in the bulk gap offers unique advantages over the usual SSE in metals and therefore opens up exciting possibilities in spintronics.

Authors:
 [1];  [2];  [3];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Univ. of California, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1257629
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Jiang, Zilong, Chang, Cui -Zu, Masir, Massoud Ramezani, Tang, Chi, Xu, Yadong, Moodera, Jagadeesh S., MacDonald, Allan H., and Shi, Jing. Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states. United States: N. p., 2016. Web. doi:10.1038/ncomms11458.
Jiang, Zilong, Chang, Cui -Zu, Masir, Massoud Ramezani, Tang, Chi, Xu, Yadong, Moodera, Jagadeesh S., MacDonald, Allan H., & Shi, Jing. Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states. United States. https://doi.org/10.1038/ncomms11458
Jiang, Zilong, Chang, Cui -Zu, Masir, Massoud Ramezani, Tang, Chi, Xu, Yadong, Moodera, Jagadeesh S., MacDonald, Allan H., and Shi, Jing. Wed . "Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states". United States. https://doi.org/10.1038/ncomms11458. https://www.osti.gov/servlets/purl/1257629.
@article{osti_1257629,
title = {Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states},
author = {Jiang, Zilong and Chang, Cui -Zu and Masir, Massoud Ramezani and Tang, Chi and Xu, Yadong and Moodera, Jagadeesh S. and MacDonald, Allan H. and Shi, Jing},
abstractNote = {Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demonstrate this property using the spin Seebeck effect (SSE), that is, measuring the transverse thermoelectric response to a temperature gradient across a thin film of yttrium iron garnet, an insulating ferrimagnet, and forming a heterojunction with (BixSb1–x)2Te3, a topological insulator. The non-equilibrium magnon population established at the interface can decay in part by interactions of magnons with electrons near the Fermi energy of the topological insulator. When this decay channel is made active by tuning (BixSb1–x)2Te3 into a bulk insulator, a large electromotive force emerges in the direction perpendicular to the in-plane magnetization of yttrium iron garnet. Lastly, the enhanced, tunable SSE which occurs when the Fermi level lies in the bulk gap offers unique advantages over the usual SSE in metals and therefore opens up exciting possibilities in spintronics.},
doi = {10.1038/ncomms11458},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Wed May 04 00:00:00 EDT 2016},
month = {Wed May 04 00:00:00 EDT 2016}
}

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