Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

Peng Li; Chuan Xia; Jun Li; Zhiyong Zhu; Yan Wen; Qiang Zhang; Junwei Zhang; Yong Peng; Husam N. Alshareef; Xixiang Zhang

doi:10.1021/acsnano.7b01743

Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

Peng Li, Chuan Xia, Jun Li, Zhiyong Zhu, Yan Wen, Qiang Zhang, Junwei Zhang, Yong Peng, Husam N. Alshareef, Xixiang Zhang

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

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.

Original language	English (US)
Pages (from-to)	5011-5019
Number of pages	9
Journal	ACS Nano
Volume	11
Issue number	5
DOIs	https://doi.org/10.1021/acsnano.7b01743
State	Published - May 10 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): CRF-2015-SENSORS-2709
Acknowledgements: 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.

Access to Document

10.1021/acsnano.7b01743

Cite this

@article{04cba9f2ef254cb7b8af839bae7d0f65,

title = "Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation",

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.",

author = "Peng Li and Chuan Xia and Jun Li and Zhiyong Zhu and Yan Wen and Qiang Zhang and Junwei Zhang and Yong Peng and Alshareef, {Husam N.} and Xixiang Zhang",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): CRF-2015-SENSORS-2709 Acknowledgements: 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.",

year = "2017",

month = may,

day = "10",

doi = "10.1021/acsnano.7b01743",

language = "English (US)",

volume = "11",

pages = "5011--5019",

journal = "ACS Nano",

issn = "1936-0851",

publisher = "American Chemical Society",

number = "5",

}

TY - JOUR

T1 - Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

AU - Li, Peng

AU - Xia, Chuan

AU - Li, Jun

AU - Zhu, Zhiyong

AU - Wen, Yan

AU - Zhang, Qiang

AU - Zhang, Junwei

AU - Peng, Yong

AU - Alshareef, Husam N.

AU - Zhang, Xixiang

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): CRF-2015-SENSORS-2709 Acknowledgements: 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.

PY - 2017/5/10

Y1 - 2017/5/10

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/623913

UR - http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01743

UR - http://www.scopus.com/inward/record.url?scp=85019924166&partnerID=8YFLogxK

U2 - 10.1021/acsnano.7b01743

DO - 10.1021/acsnano.7b01743

M3 - Article

C2 - 28480708

SN - 1936-0851

VL - 11

SP - 5011

EP - 5019

JO - ACS Nano

JF - ACS Nano

IS - 5

ER -

Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this