Please use this identifier to cite or link to this item: https://doi.org/10.1021/acsnano.6b06286
Title: Origin of Contact Resistance at Ferromagnetic Metal-Graphene Interfaces
Authors: Khoo, Khoong Hong 
Leong, Wei Sun 
Thong, John TL 
Quek, Su Ying 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
Graphene
Contact resistance
Edge contacts
Ferromagnet
Spin Transmission
Spin Filtering
LAYER GRAPHENE
EDGE CONTACTS
DEVICES
TEMPERATURE
SPIN
Issue Date: 1-Dec-2016
Publisher: AMERICAN CHEMICAL SOCIETY
Citation: Khoo, Khoong Hong, Leong, Wei Sun, Thong, John TL, Quek, Su Ying (2016-12-01). Origin of Contact Resistance at Ferromagnetic Metal-Graphene Interfaces. ACS NANO 10 (12) : 11219-11227. ScholarBank@NUS Repository. https://doi.org/10.1021/acsnano.6b06286
Abstract: © 2016 American Chemical Society. Edge contact geometries are thought to yield ultralow contact resistances in most nonferromagnetic metal-graphene interfaces, owing to their large metal-graphene coupling strengths. Here, we examine the contact resistance of edge- versus surface-contacted ferromagnetic metal-graphene interfaces (i.e., nickel- and cobalt-graphene interfaces) using both single-layer and few-layer graphene. Good qualitative agreement is obtained between theory and experiment. In particular, in both theory and experiment, we observe that the contact resistance of edge-contacted ferromagnetic metal-graphene interfaces is much lower than that of surface-contacted ones, for all devices studied and especially for the single-layer graphene systems. We show that this difference in resistance is not due to differences in the metal-graphene coupling strength, which we quantify using Hamiltonian matrix elements. Instead, the larger contact resistance in surface contacts results from spin filtering at the interface, in contrast to the edge-contacted case where both spins are transmitted. Temperature-dependent resistance measurements beyond the Curie temperature TC show that the spin degree of freedom is indeed important for the experimentally measured contact resistance. These results show that it is possible to induce a large change in contact resistance by changing the temperature in the vicinity of TC
Source Title: ACS NANO
URI: https://scholarbank.nus.edu.sg/handle/10635/170895
ISBN: 1936086X
ISSN: 19360851
DOI: 10.1021/acsnano.6b06286
Appears in Collections:Elements
Staff Publications

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
1706.09591v1.pdf1.51 MBAdobe PDF

OPEN

Post-printView/Download

SCOPUSTM   
Citations

12
checked on May 11, 2021

Page view(s)

75
checked on May 14, 2021

Download(s)

1
checked on May 14, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.