journal article·2019-01-09

High-Magnetization Tetragonal Ferrite-Based Films Induced by Carbon and Oxygen Vacancy Pairs

Wen Xiao, Yang Yang, Xiao Chi, Binghai Liu, Yonghua Du, Ping Yang, Tun Seng Herng, Daqiang Gao, Wendong Song, Yuan Ping Feng, Andrivo Rusydi, Jun Ding

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Abstract

Herein, a low-temperature thermal decomposition method is utilized to grow new stable tetragonal Fe3O4-based thick ferrite films. The tetragonal Fe3O4-based film possesses high saturation magnetization of ∼800 emu/cm3. Doping with approximately 10% Co results in a high-energy product of ∼10.9 MGOe with perpendicular magnetocrystalline anisotropy, whereas doping with Ni increases electrical resistivity by a factor of 6 and retains excellent soft magnetic properties (high saturation magnetization and low coercivity). A combined experimental and first-principles study reveals that carbon interstitials (CiB) and oxygen vacancies (VO) form CiB–VO pairs which stabilize the tetragonal phase and enhance saturation magnetization. The magnetization enhancement is further attributed to local ferromagnetic coupling between FeA and FeB induced by CiB–VO pairs in a tetragonal spinel ferrite lattice.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Iron oxide chemistry and applications · Magnetic properties of thin films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore

College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, P. R. China

Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore

Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore

Department of Product, Test and Failure Analysis, GLOBALFOUNDRIES, Singapore Pte. Ltd., Singapore 738406, Singapore

Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore

Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, P. R. China

Data Storage Institute, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-01 Innovis, Singapore 138634, Singapore

Funding

National Research Foundation Singapore · National University of Singapore

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