Patterning of L10 FePt nanoparticles with ultra-high coercivity for bit-patterned media

Zhengong Meng; Guijun Li; Hon-Fai Wong; Sheung-Mei Ng; Sze-Chun Yiu; Cheuk-Lam Ho; Chi-Wah Leung; Ian Manners; Wai-Yeung Wong

doi:10.1039/c6nr07863j

Patterning of L1₀ FePt nanoparticles with ultra-high coercivity for bit-patterned media

Nanoscale. 2017 Jan 5;9(2):731-738. doi: 10.1039/c6nr07863j.

Authors

Zhengong Meng¹, Guijun Li², Hon-Fai Wong², Sheung-Mei Ng², Sze-Chun Yiu¹, Cheuk-Lam Ho¹, Chi-Wah Leung², Ian Manners³, Wai-Yeung Wong⁴

Affiliations

¹ Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China. rwywong@hkbu.edu.hk clamho@hkbu.edu.hk.
² Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China. dennis.leung@polyu.edu.hk.
³ School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK. Ian.Manners@bristol.ac.uk.
⁴ Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China. rwywong@hkbu.edu.hk clamho@hkbu.edu.hk and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China. wai-yeung.wong@polyu.edu.hk.

PMID: 27959375
DOI: 10.1039/c6nr07863j

Abstract

L1₀-ordered FePt nanoparticles (NPs) with ultra-high coercivity were directly prepared from a new metallopolyyne using a one-step pyrolysis method. The chemical ordering, morphology and magnetic properties of the as-synthesized FePt NPs have been studied. Magnetic measurements show the coercivity of these FePt NPs is as high as 3.6 T. Comparison of NPs synthesized under the Ar and Ar/H₂ atmospheres shows that the presence of H₂ in the annealing environment influences the nucleation and promotes the growth of L1₀-FePt NPs. Application of this metallopolymer for bit-patterned media was also demonstrated using nanoimprint lithography.