Modified spin relaxation mechanism by tunable coupling between interfacial two-dimensional electron gases in correlated oxide heterostructures

M. Huijben, G.W.J. Hassink, M.P. Stehno, Zhaoliang Liao, A.J.H.M. Rijnders, Alexander Brinkman, G. Koster

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Abstract

Control of spin relaxation is an important prerequisite for the successful implementation of spintronic devices in a materials system. We realized two directly coupled two-dimensional (2D) electron gases (2DEG-2DEG) in a LaAlO3−SrTiO3 heterostructure system and observed a modification of the spin relaxation mechanism by varying the coupling strength. A strong enhancement of the carrier density for separation distances below a critical thickness of 6 unit cells was revealed. Electric-field-dependent analysis demonstrated tuning from positive to negative magnetoresistance for large separation distances of 10 unit cells indicating Rashba-type spin-orbit coupling, while for small separation distances of only 1 unit cell the magnetoresistance always remained positive. Analysis of the spin-orbit relaxation time and elastic scattering time revealed a modification of the spin relaxation mechanism between Elliott-Yafet and D’yakonov-Perel’ for separation distances of 1 and 10 unit cells, respectively. The tunable spin relaxation fits very well with the presence (or absence) of structural inversion symmetry in our coupled 2DEGs system for different separation distances.
Original languageEnglish
Article number075310
Number of pages11
JournalPhysical review B: Covering condensed matter and materials physics
Volume96
Issue number7
DOIs
Publication statusPublished - 2017

Fingerprint

Two dimensional electron gas
Oxides
electron gas
Heterojunctions
oxides
Magnetoresistance
cells
Orbits
Magnetoelectronics
Elastic scattering
orbits
Relaxation time
Carrier concentration
Tuning
Electric fields
elastic scattering
relaxation time
tuning
inversions
electric fields

Cite this

@article{58828b375eb64909a532b8f692ed6976,
title = "Modified spin relaxation mechanism by tunable coupling between interfacial two-dimensional electron gases in correlated oxide heterostructures",
abstract = "Control of spin relaxation is an important prerequisite for the successful implementation of spintronic devices in a materials system. We realized two directly coupled two-dimensional (2D) electron gases (2DEG-2DEG) in a LaAlO3−SrTiO3 heterostructure system and observed a modification of the spin relaxation mechanism by varying the coupling strength. A strong enhancement of the carrier density for separation distances below a critical thickness of 6 unit cells was revealed. Electric-field-dependent analysis demonstrated tuning from positive to negative magnetoresistance for large separation distances of 10 unit cells indicating Rashba-type spin-orbit coupling, while for small separation distances of only 1 unit cell the magnetoresistance always remained positive. Analysis of the spin-orbit relaxation time and elastic scattering time revealed a modification of the spin relaxation mechanism between Elliott-Yafet and D’yakonov-Perel’ for separation distances of 1 and 10 unit cells, respectively. The tunable spin relaxation fits very well with the presence (or absence) of structural inversion symmetry in our coupled 2DEGs system for different separation distances.",
author = "M. Huijben and G.W.J. Hassink and M.P. Stehno and Zhaoliang Liao and A.J.H.M. Rijnders and Alexander Brinkman and G. Koster",
year = "2017",
doi = "10.1103/PhysRevB.96.075310",
language = "English",
volume = "96",
journal = "Physical review B: Covering condensed matter and materials physics",
issn = "2469-9950",
publisher = "American Institute of Physics",
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TY - JOUR

T1 - Modified spin relaxation mechanism by tunable coupling between interfacial two-dimensional electron gases in correlated oxide heterostructures

AU - Huijben, M.

AU - Hassink, G.W.J.

AU - Stehno, M.P.

AU - Liao, Zhaoliang

AU - Rijnders, A.J.H.M.

AU - Brinkman, Alexander

AU - Koster, G.

PY - 2017

Y1 - 2017

N2 - Control of spin relaxation is an important prerequisite for the successful implementation of spintronic devices in a materials system. We realized two directly coupled two-dimensional (2D) electron gases (2DEG-2DEG) in a LaAlO3−SrTiO3 heterostructure system and observed a modification of the spin relaxation mechanism by varying the coupling strength. A strong enhancement of the carrier density for separation distances below a critical thickness of 6 unit cells was revealed. Electric-field-dependent analysis demonstrated tuning from positive to negative magnetoresistance for large separation distances of 10 unit cells indicating Rashba-type spin-orbit coupling, while for small separation distances of only 1 unit cell the magnetoresistance always remained positive. Analysis of the spin-orbit relaxation time and elastic scattering time revealed a modification of the spin relaxation mechanism between Elliott-Yafet and D’yakonov-Perel’ for separation distances of 1 and 10 unit cells, respectively. The tunable spin relaxation fits very well with the presence (or absence) of structural inversion symmetry in our coupled 2DEGs system for different separation distances.

AB - Control of spin relaxation is an important prerequisite for the successful implementation of spintronic devices in a materials system. We realized two directly coupled two-dimensional (2D) electron gases (2DEG-2DEG) in a LaAlO3−SrTiO3 heterostructure system and observed a modification of the spin relaxation mechanism by varying the coupling strength. A strong enhancement of the carrier density for separation distances below a critical thickness of 6 unit cells was revealed. Electric-field-dependent analysis demonstrated tuning from positive to negative magnetoresistance for large separation distances of 10 unit cells indicating Rashba-type spin-orbit coupling, while for small separation distances of only 1 unit cell the magnetoresistance always remained positive. Analysis of the spin-orbit relaxation time and elastic scattering time revealed a modification of the spin relaxation mechanism between Elliott-Yafet and D’yakonov-Perel’ for separation distances of 1 and 10 unit cells, respectively. The tunable spin relaxation fits very well with the presence (or absence) of structural inversion symmetry in our coupled 2DEGs system for different separation distances.

U2 - 10.1103/PhysRevB.96.075310

DO - 10.1103/PhysRevB.96.075310

M3 - Article

VL - 96

JO - Physical review B: Covering condensed matter and materials physics

JF - Physical review B: Covering condensed matter and materials physics

SN - 2469-9950

IS - 7

M1 - 075310

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