Intermetallic magnetic nanoparticle precipitation by femtosecond laser fragmentation in liquid

Takashi Yamamoto; Yasuhiko Shimotsuma; Masaaki Sakakura; Masayuki Nishi; Kiyotaka Miura; Kazuyuki Hirao

doi:10.1021/la201211e

Intermetallic magnetic nanoparticle precipitation by femtosecond laser fragmentation in liquid

Langmuir. 2011 Jul 5;27(13):8359-64. doi: 10.1021/la201211e. Epub 2011 Jun 8.

Authors

Takashi Yamamoto¹, Yasuhiko Shimotsuma, Masaaki Sakakura, Masayuki Nishi, Kiyotaka Miura, Kazuyuki Hirao

Affiliation

¹ Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.

PMID: 21650150
DOI: 10.1021/la201211e

Abstract

Intermetallic Nd(2)Fe(14)B nanoparticles with an average diameter of 30 nm, which are smaller than a theoretical single magnetic domain size of 220 nm, were successfully prepared by the femtosecond laser fragmentation in liquid. The self-passivating amorphous carbon layer resulting from the decomposition of the surrounding solvent prevents the Nd(2)Fe(14)B nanoparticle from aggregation and oxidation. The coercivity of Nd(2)Fe(14)B nanoparticle increases with increase of the laser irradiation time, despite the reduction of crystallinity.