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Au Quantum-Dots Engineered Room Temperature Crystallization and Magnetic Anisotropy in CoFe2O4 Thin Film


This work for the first time unfurls a novel room temperature time-effective concept to manipulate the crystallization kinetics and magnetic response of thin films grown on amorphous substrate. Conventionally, metal induced crystallization is adopted to minimize the crystallization temperature of the upper-layer thin film. However, due to the limited surface area of continuous metal under-layer the degree of crystallization is insufficient and require post-annealing. To expose the large surface area of metal under-layer, we proposed a simple and novel approach Au nanodots array instead of continuous metallic under layer to gain crystallization in upper-layer thin film. Spinel cobalt ferrite (CFO) thin film as a ‘model’ was deposited on the Au nano-dots array for the realization of methodology. Our findings revealed that the addition of quantum sized Au nano-dots as a metal under-layer dramatically promotes the crystallization of cobalt ferrite upper-layer at room temperature. The appearance of major x-ray diffraction peaks with high intensity and well-defined crystallized lattice planes observed via transmission electron microscopy confirmed the crystallization of CFO thin film deposited at room temperature on 4 nm sized Au nano-dots. Such crystallized CFO thin film exhibits 18-fold higher coercivity (Hc = 4150 Oe) and 4-fold higher saturation magnetization (Ms = 262 emu/cm3) compared to CFO deposited without Au under-layer. A crucial break-through with the development of such a novel room-temperature crystallization concept without the aid of additives and solvents is highly significant for exploring the green and energy-efficient synthesis of a variety of oxide and metal thin films.

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Publication details

The article was received on 01 Sep 2018, accepted on 24 Oct 2018 and first published on 25 Oct 2018

Article type: Communication
DOI: 10.1039/C8NH00278A
Citation: Nanoscale Horiz., 2018, Accepted Manuscript
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    Au Quantum-Dots Engineered Room Temperature Crystallization and Magnetic Anisotropy in CoFe2O4 Thin Film

    S. E. Shirsath, X. Liu, H. N. Assadi, A. Younis, Y. Yasukawa, S. K. Karan, J. Zhang, J. Kim, D. Wang, A. Morisako, Y. Yamauchi and S. Li, Nanoscale Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8NH00278A

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