Spin Injection in LaAlO3/SrTiO3 Heterostructures

Adrian Swartz; Satoshi Harashima; Yanwu Xie; Di Lu; Bongju Kim; Chris Bell; Yasuyuki Hikita; Harold Y. Hwang

doi:10.1063/1.4891174

Spin Injection in LaAlO3/SrTiO3 Heterostructures

Adrian Swartz, Satoshi Harashima, Yanwu Xie, Di Lu, Bongju Kim, Chris Bell, Yasuyuki Hikita, Harold Y. Hwang

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

35 Citations (Scopus)

Abstract

The conducting interface formed between LaAlO3 and SrTiO3 exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO3/SrTiO3 heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO3/SrTiO3 heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO3/SrTiO3 heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO3 barrier.

Original language	English
Article number	032406
Number of pages	4
Journal	Applied Physics Letters
Volume	105
Issue number	3
Early online date	23 Jul 2014
DOIs	https://doi.org/10.1063/1.4891174
Publication status	Published - Jul 2014

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10.1063/1.4891174

Dr Chris Bell
- School of Physics - Senior Lecturer
Person: Academic

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title = "Spin Injection in LaAlO3/SrTiO3 Heterostructures",

abstract = "The conducting interface formed between LaAlO3 and SrTiO3 exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO3/SrTiO3 heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO3/SrTiO3 heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO3/SrTiO3 heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO3 barrier.",

author = "Adrian Swartz and Satoshi Harashima and Yanwu Xie and Di Lu and Bongju Kim and Chris Bell and Yasuyuki Hikita and Hwang, {Harold Y.}",

year = "2014",

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doi = "10.1063/1.4891174",

language = "English",

volume = "105",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics (AIP)",

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TY - JOUR

T1 - Spin Injection in LaAlO3/SrTiO3 Heterostructures

AU - Swartz, Adrian

AU - Harashima, Satoshi

AU - Xie, Yanwu

AU - Lu, Di

AU - Kim, Bongju

AU - Bell, Chris

AU - Hikita, Yasuyuki

AU - Hwang, Harold Y.

PY - 2014/7

Y1 - 2014/7

N2 - The conducting interface formed between LaAlO3 and SrTiO3 exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO3/SrTiO3 heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO3/SrTiO3 heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO3/SrTiO3 heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO3 barrier.

AB - The conducting interface formed between LaAlO3 and SrTiO3 exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO3/SrTiO3 heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO3/SrTiO3 heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO3/SrTiO3 heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO3 barrier.

U2 - 10.1063/1.4891174

DO - 10.1063/1.4891174

M3 - Article (Academic Journal)

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 3

M1 - 032406

ER -

Spin Injection in LaAlO3/SrTiO3 Heterostructures

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