Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers

Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers

We investigate spin relaxation in graphene by systematically comparing the roles of spin absorption, other contact-induced effects (e.g., fringe fields), and bulk spin relaxation for graphene spin valves with MgO barriers, Al2O3 barriers, and transparent contacts. We obtain effective spin lifetimes...

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Main Authors: Walid Amamou, Zhisheng Lin, Jeremiah van Baren, Serol Turkyilmaz, Jing Shi, Roland K. Kawakami
Format: Article
Language:English
Published: AIP Publishing LLC 2016-03-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.4943681
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spelling doaj-18169e6a5eeb4a908031cfafa795bf522020-11-25T00:09:34ZengAIP Publishing LLCAPL Materials2166-532X2016-03-0143032503032503-910.1063/1.4943681006692APMContact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriersWalid Amamou0Zhisheng Lin1Jeremiah van Baren2Serol Turkyilmaz3Jing Shi4Roland K. Kawakami5Program of Materials Science and Engineering, University of California, Riverside, California 92521, USADepartment of Physics and Astronomy, University of California, Riverside, California 92521, USADepartment of Physics and Astronomy, University of California, Riverside, California 92521, USADepartment of Electrical and Computer Engineering, University of California, Riverside, California 92521, USAProgram of Materials Science and Engineering, University of California, Riverside, California 92521, USAProgram of Materials Science and Engineering, University of California, Riverside, California 92521, USAWe investigate spin relaxation in graphene by systematically comparing the roles of spin absorption, other contact-induced effects (e.g., fringe fields), and bulk spin relaxation for graphene spin valves with MgO barriers, Al2O3 barriers, and transparent contacts. We obtain effective spin lifetimes by fitting the Hanle spin precession data with two models that include or exclude the effect of spin absorption. Results indicate that additional contact-induced spin relaxation other than spin absorption dominates the contact effect. For tunneling contacts, we find reasonable agreement between the two models with median discrepancy of ∼20% for MgO and ∼10% for Al2O3.http://dx.doi.org/10.1063/1.4943681
collection DOAJ
language English
format Article
sources DOAJ
author Walid Amamou
Zhisheng Lin
Jeremiah van Baren
Serol Turkyilmaz
Jing Shi
Roland K. Kawakami
spellingShingle Walid Amamou
Zhisheng Lin
Jeremiah van Baren
Serol Turkyilmaz
Jing Shi
Roland K. Kawakami
Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
APL Materials
author_facet Walid Amamou
Zhisheng Lin
Jeremiah van Baren
Serol Turkyilmaz
Jing Shi
Roland K. Kawakami
author_sort Walid Amamou
title Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
title_short Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
title_full Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
title_fullStr Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
title_full_unstemmed Contact induced spin relaxation in graphene spin valves with Al2O3 and MgO tunnel barriers
title_sort contact induced spin relaxation in graphene spin valves with al2o3 and mgo tunnel barriers
publisher AIP Publishing LLC
series APL Materials
issn 2166-532X
publishDate 2016-03-01
description We investigate spin relaxation in graphene by systematically comparing the roles of spin absorption, other contact-induced effects (e.g., fringe fields), and bulk spin relaxation for graphene spin valves with MgO barriers, Al2O3 barriers, and transparent contacts. We obtain effective spin lifetimes by fitting the Hanle spin precession data with two models that include or exclude the effect of spin absorption. Results indicate that additional contact-induced spin relaxation other than spin absorption dominates the contact effect. For tunneling contacts, we find reasonable agreement between the two models with median discrepancy of ∼20% for MgO and ∼10% for Al2O3.
url http://dx.doi.org/10.1063/1.4943681
work_keys_str_mv AT walidamamou contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
AT zhishenglin contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
AT jeremiahvanbaren contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
AT serolturkyilmaz contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
AT jingshi contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
AT rolandkkawakami contactinducedspinrelaxationingraphenespinvalveswithal2o3andmgotunnelbarriers
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