(a) Room-temperature x-ray diffraction patterns of Mn1.2Ga, Mn1.4Ga, and Mn1.6Ga ribbons which are indexed to the tetragonal L10 structure. The inset shows an XRD pattern of Mn1.9Ga ribbon indexed to the tetragonal D022 structure. (b) A simulated powder x-ray diffraction pattern (Rietveld plot) corresponding to the tetragonal-L10 structure of Mn1.6Ga alloy with the experimental data (red line). The difference between the data and the fit is shown in blue color. The inset plots the lattice parameters a and c obtained from the Rietveld analysis of the XRD data as a function of y in MnyGa (y = 1.2, 1.4, and 1.6) alloy. (c) L10-MnGa unit cell.
TEM dark field image (left panel) and high resolution image (right panel) of a specimen prepared from the Mn1.6Ga ribbon.
(a) Room temperature magnetization as a function of magnetic field M(H) of MnyGa (y = 1.2, 1.4, 1.6, and 1.9) ribbons. Inset shows the M(H) hysteresis loop of a magnetic field aligned powder prepared from the Mn1.6Ga ribbon. (b) Magnetic anisotropy constant as a function of y in MnyGa. The inset of Fig. 3(b) shows how the high-field (H = 70 kOe) magnetization and coercivity change as the manganese concentration in MnyGa alloy changes.
Normalized magnetization (M/M300 K) as a function of temperature of MnyGa (y = 1.2, 1.4, 1.6, and 1.9) ribbons measured at H = 1 kOe during heating from room temperature to 800 K. The inset plots the Curie temperature as a function of y.
Relative resistance (R/R2 K) as a function of temperature of MnyGa (y = 1.2, 1.4, 1.6, and 1.9) ribbons. Inset shows the expanded view of the low-temperature (between 2 K and 25 K) R(T) curve of Mn1.2Ga ribbon.
Lattice parameters of MnyGa alloys.
Article metrics loading...
Full text loading...