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

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11458· OSTI ID:1257629
 [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)

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.

Research Organization:
Univ. of California, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012670
OSTI ID:
1257629
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 78 works
Citation information provided by
Web of Science

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Cited By (40)

Ultrafast Spin‐to‐Charge Conversion at the Surface of Topological Insulator Thin Films journal October 2018
Giant Enhancement in Rashba Spin-Seebeck Effect in NiFe/p-Si Thin Films journal April 2018
Topological insulator: Spintronics and quantum computations journal May 2019
Tetradymites as thermoelectrics and topological insulators journal September 2017
Spin injection and inverse Edelstein effect in the surface states of topological Kondo insulator SmB6 journal November 2016
Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures journal January 2018
Engineering the breaking of time-reversal symmetry in gate-tunable hybrid ferromagnet/topological insulator heterostructures journal October 2018
Thickness dependence of anomalous Nernst coefficient and longitudinal spin Seebeck effect in ferromagnetic NixFe100−x films journal July 2017
Magnetic topological insulators journal January 2019
Spin Seebeck effect and thermal spin galvanic effect in Ni 80 Fe 20 /p-Si bilayers journal January 2018
Room-temperature spin-to-charge conversion in sputtered bismuth selenide thin films via spin pumping from yttrium iron garnet journal March 2019
Interface-induced anomalous Nernst effect in Fe 3 O 4 /Pt-based heterostructures journal March 2019
Systematic control of strain-induced perpendicular magnetic anisotropy in epitaxial europium and terbium iron garnet thin films journal December 2018
Enhanced thermo-spin effects in iron-oxide/metal multilayers journal May 2018
Scanning tunneling spectroscopy of the surface states of Dirac fermions in thermoelectrics based on bismuth telluride journal March 2018
Microscopic derivation of magnon spin current in a topological insulator/ferromagnet heterostructure journal March 2017
Direct observation of magnon-phonon coupling in yttrium iron garnet journal September 2017
Dirac-surface-state-dominated spin to charge current conversion in the topological insulator ( Bi 0.22 Sb 0.78 ) 2 Te 3 films at room temperature journal November 2017
Unconventional planar Hall effect in exchange-coupled topological insulator–ferromagnetic insulator heterostructures journal September 2018
Tunneling Planar Hall Effect in Topological Insulators: Spin Valves and Amplifiers journal October 2016
Room-Temperature Spin-Orbit Torque Switching Induced by a Topological Insulator journal August 2017
Strongly extended diffusion length for the nonequilibrium magnons in Y 3 F e 5 O 12 by photoexcitation journal May 2018
Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator MnB i 2 T e 4 journal August 2019
Fermi level dependent spin pumping from a magnetic insulator into a topological insulator journal August 2019
Above 400-K robust perpendicular ferromagnetic phase in a topological insulator journal June 2017
Spintronics Based on Topological Insulators journal June 2016
Tunneling Planar Hall Effect in Topological Insulators: Spin-Valves and Amplifiers text January 2016
Spin Injection and Inverse Edelstein Effect in the Surface States of Topological Kondo Insulator SmB6 text January 2016
Microscopic derivation of magnon spin current in a topological insulator/ferromagnet heterostructure text January 2016
Room temperature spin-orbit torque switching induced by a topological insulator text January 2017
Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator text January 2017
Direct observation of magnon-phonon coupling in yttrium iron garnet text January 2017
Scanning tunneling spectroscopy of the surface states of Dirac fermions in thermoelectrics based on bismuth telluride preprint January 2017
Giant enhancement in Rashba spin-Seebeck effect in NiFe/p-Si thin films text January 2018
Unconventional Planar Hall Effect in Exchange-Coupled Topological Insulator-Ferromagnetic Insulator Heterostructures text January 2018
Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures text January 2018
Ultrafast Spin-To-Charge Conversion at the Surface of Topological Insulator Thin Films text January 2018
Systematic Control of Strain-Induced Perpendicular Magnetic Anisotropy in Epitaxial Europium and Terbium Iron Garnets Thin Films text January 2018
Fermi Level Dependent Spin Pumping from a Magnetic Insulator into a Topological Insulator text January 2019
Dirac surface state–modulated spin dynamics in a ferrimagnetic insulator at room temperature journal June 2018

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