Structural transition of ferromagnetic Ni2MnGa nanoparticles

Y. D. Wang, Y. Ren, Z. H. Nie, D. M. Liu, L. Zuo, H. Choo, H. Li, P. K. Liaw, J. Q. Yan, R. J. McQueeney, J. W. Richardson, A. Huq

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

We report here that the ball-milling process induces the phase transformation from the tetragonal structure to the disordered face-centered-cubic structure in Ni2MnGa ferromagnetic shape-memory alloys. The in situ high-energy x-ray diffraction analyses reveal that an intermediate phase, which is characterized by amorphous structure, controls the transformation kinetics during the postannealing process. Completely different from their coarse-grained counterparts, the ferromagnetic Ni2MnGa nanoparticles undergo various sequences of structural transitions that are tailored by the crystallite size, atomic order, and intrinsic magnetic structure.

Original languageEnglish
Article number063530
JournalJournal of Applied Physics
Volume101
Issue number6
DOIs
StatePublished - 2007
Externally publishedYes

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