標題: Enhancing the magnetic moment of ferrimagnetic NiCo2O4 via ion irradiation driven oxygen vacancies
作者: Pandey, Parul
Bitla, Yugandhar
Zschornak, Matthias
Wang, Mao
Xu, Chi
Grenzer, Joerg
Meyer, Dirk-Carl
Chin, Yi-Ying
Lin, Hong-Ji
Chen, Chien-Te
Gemming, Sibylle
Helm, Manfred
Chu, Ying-Hao
Zhou, Shengqiang
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Jun-2018
摘要: Ion irradiation has emerged as a powerful tool for the efficient control of uniaxial lattice expansion to fine tune and modulate the otherwise inaccessible complex correlated phases in oxide thin-films. We report the fine tuning of the magnetic moment, ferromagnetic-paramagnetic and metal-insulator transition temperatures in the NiCo2O4 inverse-spinel oxide by creating oxygen deficiencies, employing high energy He-ion irradiation. Tailoring of oxygen vacancies and consequently a uniaxial lattice expansion in the out-of-plane direction drives the system toward the increase of the magnetic moment by two-times in magnitude. The magnetic moment increases with the He-ion irradiation fluence up to 2.5 x 10(16)/cm(2) . Our results are corroborated well by spin-polarized electronic structure calculations with density functional theory and X-ray absorption spectroscopic data, which show peak-height change and energy shift of Co-L-2,L-3 and Ni-L-2,L-3 edges driven by the oxygen vacancies. These results demonstrate a new pathway of tailoring oxygen vacancies via He-ion irradiation, useful for designing new functionalities in other complex oxide thin-films. (C) 2018 Author(s).
URI: http://dx.doi.org/10.1063/1.5036941
http://hdl.handle.net/11536/145195
ISSN: 2166-532X
DOI: 10.1063/1.5036941
期刊: APL MATERIALS
Volume: 6
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