Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

Handle URI:
http://hdl.handle.net/10754/623913
Title:
Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation
Authors:
Li, Peng ( 0000-0001-8633-9045 ) ; Xia, Chuan ( 0000-0003-4526-159X ) ; Li, Jun; Zhu, Zhiyong; Wen, Yan; Zhang, Qiang; Zhang, Junwei; Peng, Yong; Alshareef, Husam N. ( 0000-0001-5029-2142 ) ; Zhang, Xixiang ( 0000-0002-3478-6414 )
Abstract:
The coexistence of ferromagnetic metallic phase and antiferromagnetic insulating phase in nanoscaled inhomogeneous perovskite oxides accounts for the colossal magnetoresistance. Although the model of spin-polarized electron transport across antiphase boundaries has been commonly employed to account for large magnetoresistance (MR) in ferrites, the magnetic anomalies, the two magnetic phases and enhanced molecular moment, are still unresolved. We observed a sizable MR in epitaxial spinel films (NiCo2O4-δ) that is much larger than that commonly observed in spinel ferrites. Detailed analysis reveals that this MR can be attributed to phase separation, in which the perfect ferrimagnetic metallic phase and ferrimagnetic insulating phase coexist. The magnetic insulating phase plays an important role in spin filtering in these phase separated spinel oxides, leading to a sizable MR effect. A spin filtering model based on Zeeman effect and direct tunneling is developed to account for MR of the phase separated films.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; KAUST Supercomputing Laboratory (KSL)
Citation:
Li P, Xia C, Li J, Zhu Z, Wen Y, et al. (2017) Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation. ACS Nano 11: 5011–5019. Available: http://dx.doi.org/10.1021/acsnano.7b01743.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Nano
KAUST Grant Number:
CRF-2015-SENSORS-2709
Issue Date:
8-May-2017
DOI:
10.1021/acsnano.7b01743
Type:
Article
ISSN:
1936-0851; 1936-086X
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). P.L. acknowledges the financial support of CRF-2015-SENSORS-2709 (KAUST) and SABIC postdoctoral fellowship award presented to KAUST.
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01743
Appears in Collections:
Articles; KAUST Supercomputing Laboratory (KSL); Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Pengen
dc.contributor.authorXia, Chuanen
dc.contributor.authorLi, Junen
dc.contributor.authorZhu, Zhiyongen
dc.contributor.authorWen, Yanen
dc.contributor.authorZhang, Qiangen
dc.contributor.authorZhang, Junweien
dc.contributor.authorPeng, Yongen
dc.contributor.authorAlshareef, Husam N.en
dc.contributor.authorZhang, Xixiangen
dc.date.accessioned2017-05-31T11:23:13Z-
dc.date.available2017-05-31T11:23:13Z-
dc.date.issued2017-05-08en
dc.identifier.citationLi P, Xia C, Li J, Zhu Z, Wen Y, et al. (2017) Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation. ACS Nano 11: 5011–5019. Available: http://dx.doi.org/10.1021/acsnano.7b01743.en
dc.identifier.issn1936-0851en
dc.identifier.issn1936-086Xen
dc.identifier.doi10.1021/acsnano.7b01743en
dc.identifier.urihttp://hdl.handle.net/10754/623913-
dc.description.abstractThe coexistence of ferromagnetic metallic phase and antiferromagnetic insulating phase in nanoscaled inhomogeneous perovskite oxides accounts for the colossal magnetoresistance. Although the model of spin-polarized electron transport across antiphase boundaries has been commonly employed to account for large magnetoresistance (MR) in ferrites, the magnetic anomalies, the two magnetic phases and enhanced molecular moment, are still unresolved. We observed a sizable MR in epitaxial spinel films (NiCo2O4-δ) that is much larger than that commonly observed in spinel ferrites. Detailed analysis reveals that this MR can be attributed to phase separation, in which the perfect ferrimagnetic metallic phase and ferrimagnetic insulating phase coexist. The magnetic insulating phase plays an important role in spin filtering in these phase separated spinel oxides, leading to a sizable MR effect. A spin filtering model based on Zeeman effect and direct tunneling is developed to account for MR of the phase separated films.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). P.L. acknowledges the financial support of CRF-2015-SENSORS-2709 (KAUST) and SABIC postdoctoral fellowship award presented to KAUST.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acsnano.7b01743en
dc.subjectPhase separationen
dc.subjectZeeman Effecten
dc.subjectDirect Tunnelingen
dc.subjectSpin Filteren
dc.subjectSpinelen
dc.subjectMagnetoresistanceen
dc.titleSpin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separationen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentKAUST Supercomputing Laboratory (KSL)en
dc.identifier.journalACS Nanoen
dc.contributor.institutionKey Laboratory of Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University , Lanzhou 730000, Gansu, PR China.en
kaust.authorLi, Pengen
kaust.authorXia, Chuanen
kaust.authorLi, Junen
kaust.authorZhu, Zhiyongen
kaust.authorWen, Yanen
kaust.authorZhang, Qiangen
kaust.authorZhang, Junweien
kaust.authorAlshareef, Husam N.en
kaust.authorZhang, Xixiangen
kaust.grant.numberCRF-2015-SENSORS-2709en
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