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Title: Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films

Abstract

The inverse spinel ferrimagnetic NiCo2O4 presents a unique model system for studying the competing effects of crystalline fields, magnetic exchange, and various types of chemical and lattice disorder on the electronic and magnetic states. Here, magnetotransport anomalies in high–quality epitaxial NiCo2O4 thin films resulting from the complex energy landscape are reported. A strong out–of–plane magnetic anisotropy, linear magnetoresistance, and robust anomalous Hall effect above 300 K are observed in 5–30 unit cell NiCo2O4 films. The anomalous Hall resistance exhibits a nonmonotonic temperature dependence that peaks around room temperature, and reverses its sign at low temperature in films thinner than 20 unit cells. The scaling relation between the anomalous Hall conductivity and longitudinal conductivity reveals the intricate interplay between the spin–dependent impurity scattering, band intrinsic Berry phase effect, and electron correlation. Here, this study provides important insights into the functional design of NiCo2O4 for developing spinel–based spintronic applications.

Authors:
 [1];  [1]; ORCiD logo [2];  [1];  [2];  [1]; ORCiD logo [1]
  1. Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1495005
Alternate Identifier(s):
OSTI ID: 1483910
Report Number(s):
BNL-211269-2019-JAAM
Journal ID: ISSN 0935-9648
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 31; Journal Issue: 4; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Inverse spinel; epitaxial thin film; anomalous Hall effect; Berry phase effect; perpendicular magnetic anisotropy

Citation Formats

Chen, Xuegang, Zhang, Xiaozhe, Han, Myung -Geun, Zhang, Le, Zhu, Yimei, Xu, Xiaoshan, and Hong, Xia. Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films. United States: N. p., 2018. Web. doi:10.1002/adma.201805260.
Chen, Xuegang, Zhang, Xiaozhe, Han, Myung -Geun, Zhang, Le, Zhu, Yimei, Xu, Xiaoshan, & Hong, Xia. Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films. United States. https://doi.org/10.1002/adma.201805260
Chen, Xuegang, Zhang, Xiaozhe, Han, Myung -Geun, Zhang, Le, Zhu, Yimei, Xu, Xiaoshan, and Hong, Xia. Thu . "Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films". United States. https://doi.org/10.1002/adma.201805260. https://www.osti.gov/servlets/purl/1495005.
@article{osti_1495005,
title = {Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films},
author = {Chen, Xuegang and Zhang, Xiaozhe and Han, Myung -Geun and Zhang, Le and Zhu, Yimei and Xu, Xiaoshan and Hong, Xia},
abstractNote = {The inverse spinel ferrimagnetic NiCo2O4 presents a unique model system for studying the competing effects of crystalline fields, magnetic exchange, and various types of chemical and lattice disorder on the electronic and magnetic states. Here, magnetotransport anomalies in high–quality epitaxial NiCo2O4 thin films resulting from the complex energy landscape are reported. A strong out–of–plane magnetic anisotropy, linear magnetoresistance, and robust anomalous Hall effect above 300 K are observed in 5–30 unit cell NiCo2O4 films. The anomalous Hall resistance exhibits a nonmonotonic temperature dependence that peaks around room temperature, and reverses its sign at low temperature in films thinner than 20 unit cells. The scaling relation between the anomalous Hall conductivity and longitudinal conductivity reveals the intricate interplay between the spin–dependent impurity scattering, band intrinsic Berry phase effect, and electron correlation. Here, this study provides important insights into the functional design of NiCo2O4 for developing spinel–based spintronic applications.},
doi = {10.1002/adma.201805260},
journal = {Advanced Materials},
number = 4,
volume = 31,
place = {United States},
year = {Thu Nov 29 00:00:00 EST 2018},
month = {Thu Nov 29 00:00:00 EST 2018}
}

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Works referencing / citing this record:

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