Structural transition of ferromagnetic Ni2MnGa nanoparticles

TitleStructural transition of ferromagnetic Ni2MnGa nanoparticles
Publication TypeJournal Article
Year of Publication2007
AuthorsWang YD, Ren Y, Nie ZH, Liu DM, Zuo L, Choo H, Li H, Liaw PK, Yan JQ, McQueeney RJ, Richardson JW, Huq A
Journal TitleJournal of Applied Physics
Date PublishedMar
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberISI:000245317700051
Keywordscrystal-structure, hydrostatic-pressure, MARTENSITIC TRANSFORMATIONS, ni-mn-ga, order, PHASE-TRANSFORMATION, room-temperature, shape-memory alloys

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. (c) 2007 American Institute of Physics.

Alternate JournalJ. Appl. Phys.