Structural transition of ferromagnetic Ni{sub 2}MnGa nanoparticles.

Journal Article · Mon Jan 01 00:00:00 EST 2007 · J. Appl. Phys.

DOI:https://doi.org/10.1063/1.2713370· OSTI ID:920004

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

We report here that the ball-milling process induces the phase transformation from the tetragonal structure to the disordered face-centered-cubic structure in Ni{sub 2}MnGa 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 Ni{sub 2}MnGa nanoparticles undergo various sequences of structural transitions that are tailored by the crystallite size, atomic order, and intrinsic magnetic structure.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC); National Science Foundation Institutional Materials Institues
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 920004
• Report Number(s): ANL/XSD/JA-60510; JAPIAU; TRN: US200822%%503
• Journal Information: J. Appl. Phys., Vol. 101, Issue 2007; ISSN 0021-8979
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
NICKEL ALLOYS
MANGANESE ALLOYS
GALLIUM ALLOYS
FCC LATTICES
PHASE TRANSFORMATIONS
X-RAY DIFFRACTION
MILLING
SHAPE MEMORY EFFECT
FERROMAGNETIC MATERIALS
NANOSTRUCTURES