Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation
Type
ArticleAuthors
Li, Peng
Xia, Chuan

Li, Jun
Zhu, Zhiyong
Wen, Yan
Zhang, Qiang

Zhang, Junwei
Peng, Yong
Alshareef, Husam N.

Zhang, Xixiang

KAUST Department
Functional Nanomaterials and Devices Research GroupImaging and Characterization Core Lab
KAUST Supercomputing Laboratory (KSL)
Material Science and Engineering Program
Nanofabrication Core Lab
Physical Science and Engineering (PSE) Division
Supercomputing, Computational Scientists
Thin Films & Characterization
KAUST Grant Number
CRF-2015-SENSORS-2709Date
2017-05-10Online Publication Date
2017-05-10Print Publication Date
2017-05-23Permanent link to this record
http://hdl.handle.net/10754/623913
Metadata
Show full item recordAbstract
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.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.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.Publisher
American Chemical Society (ACS)Journal
ACS NanoPubMed ID
28480708Additional Links
http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01743ae974a485f413a2113503eed53cd6c53
10.1021/acsnano.7b01743
Scopus Count
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