Peculiar thickness dependence of perpendicular magnetic anisotropy in epitaxial NiCo2O4 spinel films

Author:

Xi Zhongnan1ORCID,Wang Yuqi1ORCID,Wu Yang1ORCID,Hou Pengxiang1ORCID,Jiao Peijie1ORCID,Deng Yu1ORCID,Yang Yurong1ORCID,Wu Di1ORCID

Affiliation:

1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Jiangsu Key Laboratory of Artificial Functional Materials, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China

Abstract

We reported a peculiar thickness dependence of perpendicular magnetic anisotropy (PMA), stronger in thinner films, in spinel NiCo2O4 (NCO) films deposited epitaxially on MgAl2O4 (001) single crystalline substrates. The effective PMA field is about 3 T in 23.0 nm-thick films but increases dramatically to about 7 T in 4.5 nm-thick films. X-ray absorption spectra reveal an inhomogeneous distribution of Co2+ cations along the film's normal with more Co2+ adjacent to the film/substrate interface. X-ray linear dichroism spectra reveal that the PMA in NCO films is associated with electrons occupying the x2–y2 orbital of Co cations at the tetrahedral sites. This work demonstrates the potential of ultrathin NCO films in all-oxide spintronic devices.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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