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Article: Electronic transport through a graphene-based ferromagnetic/normal/ ferromagnetic junction

TitleElectronic transport through a graphene-based ferromagnetic/normal/ ferromagnetic junction
Authors
Issue Date2010
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpcm
Citation
Journal Of Physics Condensed Matter, 2010, v. 22 n. 3 How to Cite?
AbstractElectronic transport in a graphene-based ferromagnetic/normal/ferromagnetic junction is investigated by means of the Landauer-Büttiker formalism and the nonequilibrium Green function technique. For the zigzag edge case, the results show that the conductance is always larger than e2/h for the parallel configuration of lead magnetizations, but for the antiparallel configuration the conductance becomes zero because of the band-selective rule. Therefore, a magnetoresistance (MR) plateau emerges with the value 100% when the Fermi energy is located around the Dirac point. In addition, choosing narrower graphene ribbons can yield wider 100% MR plateaus and the length change of the central graphene region does not affect the 100% MR plateaus. Although the disorder will reduce the MR plateau, the plateau value can still be kept about 50% even in a large disorder strength case. In addition, when the magnetizations of the left and right leads have a relative angle, the conductance changes as a cosine function of the angle. What is more, for the armchair edge case, the MR is usually small. So, it is more favorable to fabricate a graphene-based spin valve device by using a zigzag edge graphene ribbon. © 2010 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/80738
ISSN
2015 Impact Factor: 2.209
2015 SCImago Journal Rankings: 0.812
ISI Accession Number ID
Funding AgencyGrant Number
NSF-China10525418
10734110
10821403
973 Program2009CB929103
Research Grant Council of Hong KongHKU 7042/06P
HKU 10/CRF/08
Science Foundation of Northwest University09NW29
Funding Information:

We gratefully acknowledge the financial support from NSF-China under Grants Nos 10525418, 10734110, and 10821403, the 973 Program Project No. 2009CB929103, and the Research Grant Council of Hong Kong under Grant No. HKU 7042/06P and HKU 10/CRF/08. Shu-guang Cheng was supported by the Science Foundation of Northwest University (No. 09NW29).

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorChen, JCen_HK
dc.contributor.authorCheng, SGen_HK
dc.contributor.authorShen, SQen_HK
dc.contributor.authorSun, QFen_HK
dc.date.accessioned2010-09-06T08:09:44Z-
dc.date.available2010-09-06T08:09:44Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Physics Condensed Matter, 2010, v. 22 n. 3en_HK
dc.identifier.issn0953-8984en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80738-
dc.description.abstractElectronic transport in a graphene-based ferromagnetic/normal/ferromagnetic junction is investigated by means of the Landauer-Büttiker formalism and the nonequilibrium Green function technique. For the zigzag edge case, the results show that the conductance is always larger than e2/h for the parallel configuration of lead magnetizations, but for the antiparallel configuration the conductance becomes zero because of the band-selective rule. Therefore, a magnetoresistance (MR) plateau emerges with the value 100% when the Fermi energy is located around the Dirac point. In addition, choosing narrower graphene ribbons can yield wider 100% MR plateaus and the length change of the central graphene region does not affect the 100% MR plateaus. Although the disorder will reduce the MR plateau, the plateau value can still be kept about 50% even in a large disorder strength case. In addition, when the magnetizations of the left and right leads have a relative angle, the conductance changes as a cosine function of the angle. What is more, for the armchair edge case, the MR is usually small. So, it is more favorable to fabricate a graphene-based spin valve device by using a zigzag edge graphene ribbon. © 2010 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpcmen_HK
dc.relation.ispartofJournal of Physics Condensed Matteren_HK
dc.rightsJournal of Physics: Condensed Matter. Copyright © Institute of Physics Publishing.-
dc.titleElectronic transport through a graphene-based ferromagnetic/normal/ ferromagnetic junctionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0953-8984&volume=22&issue=3, article no. 035301&spage=&epage=&date=2010&atitle=Electronic+transport+through+a+graphene-based+ferromagnetic/normal/ferromagnetic+junctionen_HK
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0953-8984/22/3/035301en_HK
dc.identifier.pmid21386283-
dc.identifier.scopuseid_2-s2.0-74949122249en_HK
dc.identifier.hkuros169484en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-74949122249&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume22en_HK
dc.identifier.issue3en_HK
dc.identifier.isiWOS:000273055400011-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectSpin transverse force and its applications in quantum spin and charge transport-
dc.identifier.scopusauthoridChen, JC=35408794400en_HK
dc.identifier.scopusauthoridCheng, SG=15759059300en_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK
dc.identifier.scopusauthoridSun, QF=34572810700en_HK

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