Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2O4 Thin Films

Chen, Xuegang; Zhang, Xiaozhe; Han, Myung -Geun; Zhang, Le; Zhu, Yimei; Xu, Xiaoshan; Hong, Xia

doi:10.1002/adma.201805260

Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo₂O₄ Thin Films

Journal Article · Thu Nov 29 00:00:00 EST 2018 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201805260· OSTI ID:1495005

Chen, Xuegang ^[1]; Zhang, Xiaozhe ^[1]; ^[2]; Zhang, Le ^[1]; Zhu, Yimei ^[2]; Xu, Xiaoshan ^[1]; ^[1]

Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1495005

Alternate ID(s):: OSTI ID: 1483910

Report Number(s):: BNL--211269-2019-JAAM

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 4 Vol. 31; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Berry phase effect
Inverse spinel
anomalous Hall effect
epitaxial thin film
perpendicular magnetic anisotropy