- Title
- Realization of High Magnetization in Artificially Designed Ni/NiO Layers through Exchange Coupling
- Creator
- Ding, Xiang; Cui, Xiangyuan; Sathish, CI; Yu, Xiaojiang; Xi, Shibo; Breese, Mark B. H.; Zheng, Rongkun; Wang, Xiaolin; Wang, Lan; Wu, Tom; Ding, Jun; Vinu, Ajayan; Tseng, Li-Ting; Ringer, Simon P.; Yi, Jiabao; Wang, Yiren; Qu, Jiangtao; Yue, Zengji; Sang, Lina; Lee, Wai Tung; Guan, Xinwei; Bao, Nina
- Relation
- Small Vol. 20, no. 2304369
- Publisher Link
- http://dx.doi.org/10.1002/smll.202304369
- Publisher
- Wiley-VCH Verlag GmbH & Co. KGaA
- Resource Type
- journal article
- Date
- 2024
- Description
- High-magnetization materials play crucial roles in various applications. However, the past few decades have witnessed a stagnation in the discovery of new materials with high magnetization. In this work, Ni/NiO nanocomposites are fabricated by depositing Ni and NiO thin layers alternately, followed by annealing at specific temperatures. Both the as-deposited samples and those annealed at 373 K exhibit low magnetization. However, the samples annealed at 473 K exhibit a significantly enhanced saturation magnetization exceeding 607 emu cm−3 at room temperature, surpassing that of pure Ni (480 emu cm−3). Material characterizations indicate that the composite comprises NiO nanoclusters of size 1–2 nm embedded in the Ni matrix. This nanoclustered NiO is primarily responsible for the high magnetization, as confirmed by density functional theory calculations. The calculations also indicate that the NiO clusters are ferromagnetically coupled with Ni, resulting in enhanced magnetization. This work demonstrates a new route toward developing artificial high-magnetization materials using the high magnetic moments of nanoclustered antiferromagnetic materials.
- Subject
- exchange coupling; first-principles calcuations; high magnetization; magnetic materials; Ni and NiO
- Identifier
- http://hdl.handle.net/1959.13/1514061
- Identifier
- uon:56809
- Identifier
- ISSN:1613-6810
- Rights
- © 2023 The Authors. Small published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Language
- eng
- Full Text
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