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Lithographic patterning of ferromagnetic FePt nanoparticles from a single-source bimetallic precursor containing hemiphasmidic structure for magnetic data recording media

半竹节虫型双金属配合物制备铁铂纳米颗粒及其图案化阵列的磁存储应用

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Abstract

Patterning of L10 FePt nanoparticles (NPs) with high coercivity offers a promising route to develop bit-patterned media (BPM) for the next generation magnetic data recording system, but the synthesis of monodisperse FePt NPs and mass production of their nanopatterns has been a long-standing challenge. Here, highly efficient nanoimprint lithography was applied for large-scale universal patterning, which was achieved by imprinting the solution of a single-source bimetallic precursor. The rigid coplanar metallic cores and the surrounding flexible tails in the bimetallic complex permit the spontaneous molecular arrangements to form the highly ordered negative morphology replicated from the soft template. In-situ pyrolysis study was then investigated by one-pot pyrolysis of the precursor under an Ar/H2 atmosphere, and the resultant NPs were fully characterized to identify the phase, morphology and magnetic properties. Finally, highly-ordered patterns on certain substrates were preserved perfectly after pyrolysis and could be potentially utilized in magnetic data recording media.

摘要

摘要L10相铁铂合金纳米颗粒具有较高的磁矫顽力, 其图案化阵列有望用于开发下一代磁性数据记录系统, 但是单分散铁铂纳米颗粒的合成及大规模制备图案化阵列的制备仍是巨大的挑战. 本文合成了一种含有铁铂的双金属配合物, 配合物由刚性的共平面金属中心和柔性尾链形成半竹节虫型结构, 这种特殊的分子结构有利于机械加工中分子有序排列. 配合物用作单源前驱体经一步热解即可制备L10相铁铂合金纳米颗粒. 另外, 借助高效的纳米印刷技术, 对配合物溶液进行压印即可制备大规模高度有序的图案化阵列, 所得阵列在氩氢混合气保护下原位热解, 形成规则的磁性阵列, 表明这种方式制备的磁性图案可用于磁数据存储设备.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21701112, 21504074 and 51573151), Hong Kong Research Grants Council (HKBU12317216, PolyU153062/18P and PolyU153015/14P), Areas of Excellence Scheme, University Grants Committee of HKSAR (AoE/P-03/08), the Hong Kong Polytechnic University (1-ZE1C and 1-ZE25), the Science, Technology and Innovation Committee of Shenzhen Municipality (JCYJ20160531193836532), and Ms Clarea Au (847S) for the Endowed Professorship in Energy.

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Authors and Affiliations

  1. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China

    Zhengong Meng  (孟振功), Zhen-Qiang Yu  (余振强) & Wai-Yeung Wong  (黄维扬)

  2. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China

    Cheuk-Lam Ho  (何卓琳) & Wai-Yeung Wong  (黄维扬)

  3. Institute of Molecular Functional Materials and Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, China

    Zhengong Meng  (孟振功), Cheuk-Lam Ho  (何卓琳), Nianyong Zhu  (朱年永) & Wai-Yeung Wong  (黄维扬)

  4. HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park, Shenzhen, 518057, China

    Zhengong Meng  (孟振功), Cheuk-Lam Ho  (何卓琳), Nianyong Zhu  (朱年永) & Wai-Yeung Wong  (黄维扬)

  5. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China

    Hon-Fai Wong  (王汉辉), Guijun Li  (李桂君) & Chi-Wah Leung  (梁志华)

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  1. Zhengong Meng  (孟振功)
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  2. Cheuk-Lam Ho  (何卓琳)
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  6. Guijun Li  (李桂君)
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  7. Chi-Wah Leung  (梁志华)
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  8. Wai-Yeung Wong  (黄维扬)
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Corresponding authors

Correspondence to Cheuk-Lam Ho  (何卓琳), Zhen-Qiang Yu  (余振强), Chi-Wah Leung  (梁志华) or Wai-Yeung Wong  (黄维扬).

Additional information

Zhengong Meng obtained his PhD degree under the supervision of Prof. Wai-Yeung Wong at Hong Kong Baptist University in 2016. He is currently a Research Associate Professor at Shenzhen University. His research focuses on magnetic alloy nanoparticles for high-density magnetic recording.

Cheuk-Lam Ho earned her PhD degree from Hong Kong Baptist University in 2007. She is currently an Assistant Professor at the Hong Kong Polytechnic University and her research interest is in functional metallophosphors and metallopolymers for light-emitting and photovoltaic applications.

Zhen-Qiang Yu received his PhD degree in polymer chemistry and physics (with Prof. Er-Qiang Chen) from Peking University in 2007 and at the same year he joined the School of Chemistry and Environmental Engineering, Shenzhen University, where he is currently an Associate Professor. From 2015 to 2017, he joined Hong Kong Baptist University as a Visiting Research Fellow with Prof. Wai-Yeung Wong. His current research interests include phase behaviors of liquid crystalline polymers, luminescent liquid crystals and liquid crystalline functional materials.

Wai-Yeung Wong obtained his PhD degree from the University of Hong Kong. He did postdoctoral works at Texas A&M University and University of Cambridge. He worked in Hong Kong Baptist University from 1998 to 2016 and he now works at The Hong Kong Polytechnic University as Chair Professor of Chemical Technology and Associate Dean of Faculty of Applied Science and Textiles. His research focuses on synthetic inorganic/organometallic chemistry, especially aiming at developing metal-organic molecules and polymers for organic optoelectronics and metal-based nanomaterials.

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40843_2018_9350_MOESM1_ESM.pdf

Lithographic patterning of ferromagnetic FePt nanoparticles from a single-source bimetallic precursor containing hemiphasmidic structure for magnetic data recording media

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Meng, Z., Ho, CL., Wong, HF. et al. Lithographic patterning of ferromagnetic FePt nanoparticles from a single-source bimetallic precursor containing hemiphasmidic structure for magnetic data recording media. Sci. China Mater. 62, 566–576 (2019). https://doi.org/10.1007/s40843-018-9350-4

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