Long-range order parameter of single L 1 0-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

Kazuhisa Sato, Yoshihiko Hirotsu, Hirotaro Mori, Zhouguang Wang, Tsukasa Hirayama

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39 Citations (Scopus)

Abstract

The long-range order (LRO) parameter (S) of single isolated L 10 -FePd nanoparticle was determined by quantitative analysis of nanobeam electron diffraction (NBD) intensities and intensity calculations considering the multiple scattering of electrons. The obtained order parameters of the nanoparticles larger than 8 nm are distributed around the mean LRO parameter (S- =0.79) which was determined by selected area electron diffraction intensity analysis, while the parameters slightly decreased gradually as the particle size decreased below about 8 nm (S=0.60-0.73). The low degree of order in very small particles is responsible for the coercivity decrease of the L 10 nanoparticles in smaller-sized regions. Quantitative NBD intensity analysis is quite useful for the determination of the LRO parameter of individual L 10 -FePd single crystalline nanoparticle. Experimental conditions required for NBD analysis are presented in detail and the possible experimental errors of the determined LRO parameters are discussed.

Original languageEnglish
Article number024308
JournalJournal of Applied Physics
Volume98
Issue number2
DOIs
Publication statusPublished - 2005 Jul 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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