Observation of large low-field magnetoresistance in spinel cobaltite: A new half-metal

Handle URI:
http://hdl.handle.net/10754/600278
Title:
Observation of large low-field magnetoresistance in spinel cobaltite: A new half-metal
Authors:
Li, Peng; Xia, Chuan ( 0000-0003-4526-159X ) ; Zheng, Dongxing; Wang, Ping; Jin, Chao; Bai, Haili
Abstract:
Low-field magnetoresistance is an effective and energy-saving way to use half-metallic materials in magnetic reading heads and magnetic random access memory. Common spin-polarized materials with low field magnetoresistance effect are perovskite-type manganese, cobalt, and molybdenum oxides. In this study, we report a new type of spinel cobaltite materials, self-assembled nanocrystalline NiCo2O4, which shows large low field magnetoresistance as large as –19.1% at 0.5 T and –50% at 9 T (2 K). The large low field magnetoresistance is attributed to the fast magnetization rotation of the core nanocrystals. The surface spin-glass is responsible for the observed weak saturation of magnetoresistance under high fields. Our calculation demonstrates that the half-metallicity of NiCo2O4 comes from the hopping eg electrons within the tetrahedral Co-atoms and the octahedral Ni-atoms. The discovery of large low-field magnetoresistance in simple spinel oxide NiCo2O4, a non-perovskite oxide, leads to an extended family of low-field magnetoresistance materials. (© 2016 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Observation of large low-field magnetoresistance in spinel cobaltite: A new half-metal 2016, 10 (2):190 physica status solidi (RRL) - Rapid Research Letters
Publisher:
Wiley-Blackwell
Journal:
physica status solidi (RRL) - Rapid Research Letters
Issue Date:
10-Dec-2015
DOI:
10.1002/pssr.201510402
Type:
Article
ISSN:
18626254
Sponsors:
This work was supported by National Natural Science Foundation of China (Grant No. 11204207) and Ph.D. Programs Foundation of Ministry of Education of the People’s Republic of China (Grant No. 20120032120074).
Additional Links:
http://doi.wiley.com/10.1002/pssr.201510402
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Pengen
dc.contributor.authorXia, Chuanen
dc.contributor.authorZheng, Dongxingen
dc.contributor.authorWang, Pingen
dc.contributor.authorJin, Chaoen
dc.contributor.authorBai, Hailien
dc.date.accessioned2016-02-28T09:48:51Zen
dc.date.available2016-02-28T09:48:51Zen
dc.date.issued2015-12-10en
dc.identifier.citationObservation of large low-field magnetoresistance in spinel cobaltite: A new half-metal 2016, 10 (2):190 physica status solidi (RRL) - Rapid Research Lettersen
dc.identifier.issn18626254en
dc.identifier.doi10.1002/pssr.201510402en
dc.identifier.urihttp://hdl.handle.net/10754/600278en
dc.description.abstractLow-field magnetoresistance is an effective and energy-saving way to use half-metallic materials in magnetic reading heads and magnetic random access memory. Common spin-polarized materials with low field magnetoresistance effect are perovskite-type manganese, cobalt, and molybdenum oxides. In this study, we report a new type of spinel cobaltite materials, self-assembled nanocrystalline NiCo2O4, which shows large low field magnetoresistance as large as –19.1% at 0.5 T and –50% at 9 T (2 K). The large low field magnetoresistance is attributed to the fast magnetization rotation of the core nanocrystals. The surface spin-glass is responsible for the observed weak saturation of magnetoresistance under high fields. Our calculation demonstrates that the half-metallicity of NiCo2O4 comes from the hopping eg electrons within the tetrahedral Co-atoms and the octahedral Ni-atoms. The discovery of large low-field magnetoresistance in simple spinel oxide NiCo2O4, a non-perovskite oxide, leads to an extended family of low-field magnetoresistance materials. (© 2016 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)en
dc.description.sponsorshipThis work was supported by National Natural Science Foundation of China (Grant No. 11204207) and Ph.D. Programs Foundation of Ministry of Education of the People’s Republic of China (Grant No. 20120032120074).en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/pssr.201510402en
dc.rightsThis is the peer reviewed version of the following article: Li, P., Xia, C., Zheng, D., Wang, P., Jin, C. and Bai, H. (2016), Observation of large low-field magnetoresistance in spinel cobaltite: A new half-metal. Phys. Status Solidi RRL, 10: 190–196., which has been published in final form at http://doi.wiley.com/10.1002/pssr.201510402. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.subjectspinel oxidesen
dc.subjectNiCo2O4en
dc.subjectmagnetoresistanceen
dc.subjecthalf metalsen
dc.subjectnanocrystalsen
dc.subjectmagnetizationen
dc.subjectdensity of statesen
dc.titleObservation of large low-field magnetoresistance in spinel cobaltite: A new half-metalen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalphysica status solidi (RRL) - Rapid Research Lettersen
dc.eprint.versionPost-printen
dc.contributor.institutionTianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University; Tianjin 300072 P. R. Chinaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorXia, Chuanen
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