Magnetotransport Anomaly in Room-Temperature Ferrimagnetic NiCo2 O4 Thin Films

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 31(2019), 4 vom: 15. Jan., Seite e1805260
Auteur principal: Chen, Xuegang (Auteur)
Autres auteurs: Zhang, Xiaozhe, Han, Myung-Geun, Zhang, Le, Zhu, Yimei, Xu, Xiaoshan, Hong, Xia
Format: Article en ligne
Langue:English
Publié: 2019
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article Berry phase effect anomalous Hall effect epitaxial thin film inverse spinel perpendicular magnetic anisotropy
Description
Résumé:© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
The inverse spinel ferrimagnetic NiCo2 O4 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 NiCo2 O4 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 NiCo2 O4 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. This study provides important insights into the functional design of NiCo2 O4 for developing spinel-based spintronic applications
Description:Date Completed 30.01.2019
Date Revised 30.09.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201805260