The structure, intrinsic magnetic properties, and magnetic hardening of L1-Mn1.15Ga alloy

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

“…It can be seen that the most stable MM-MS_B interface in D0 22 -MS/CMS and L1 0 -MS/CMS bilayers has Curie temperature above the ambient temperature, and moreover, the latter one (L1 0 -MG/CMS) has slightly higher Curie temperature than the former one (D0 22 -MS/CMS). As a comparison, we also estimate the spin exchange parameters and Curie temperature for D0 22 -MG, L1 0 -MG and CMS bulks in the same approximation, the obtained exchange parameters are 113, 29.0 and 151 meV, and the corresponding Curie temperature are 875, 213 and 1170 K, while experimental Curie temperatures are about 770 5 , above 300 48 and 985 K 17 , 19 for D0 22 -MG, L1 0 -MG and CMS bulks, respectively. Obviously, the MM-MS_B interface has the lower Curie temperatures than D0 22 -MG and CMS bulks for the D0 22 -MG/CMS bilayer, while it’s Curie temperature is between L1 0 -MG and CMS bulks for L1 0 -MG/CMS bilayer.…”

Structure and magnetic properties of L1-MnGa nanoparticles prepared using direct reactions between Mn nanoparticles and Ga

“…The M r and M s of the L1 0 -Mn 1+x Ga powders decrease slightly after ball-milling. A coercivity up to 0.96 T is measured for the ball-milled L1 0 -powders at 5 K. The coercivity of our sample is larger than that of the L1 0 -Mn 1.15 Ga alloys prepared by induction melting followed by annealing and ball milling, 6 owing to the smaller crystalline size of our samples. However, the M s of the L1 0 -Mn 1+x Ga powders is lower than that of the bulk samples, 6 owing to the presence of a large amount of uncompensated surface spins in the powder samples.…”

“…The Curie temperature (T c ) of the ball-milled L1 0 -Mn 1.5 Ga is measured to be ∼650 K, which is slightly higher than the T c =595 K of the Mn 1.15 Ga ingots. 6 There are two transition temperatures in the M-T curves of the Mn 23 Ga 77 sample. The magnetization decrement at temperatures around 430 K was ascribed to the magnetic transition of ϕ-phase, which has a T c around 463 K. 1 The magnetic transition of Mn 23 Ga 77 sample at ∼650 K originates from the L1 0 -Mn 1+x Ga phase presents in the sample.…”

“…The bulk samples of L1 0 -MnGa phase with high saturation magnetization were usually prepared by melting the ingots followed by annealing and/or quenching process. 6,7 The growth and characterizations of the L1 0 -MnGa films have been extensively studied since the observation of the square perpendicular hysteresis of Mn x Ga (1.2<x<1.5) films in 1990s. 3,8,9 The L1 0 -MnGa microparticles with size in the range of 10-50 µm had been prepared by high energy ball milling and subsequent annealing.…”

Atomic Migration and Ordering of Binary Ferromagnetic Intermetallic L10Phases and Influences of Alloying Elements and Electric Fields

“…A more slowly ordering counterpart to MnAl is MnGa. [ 25 ] The MnGa system is less well understood than the other three mentioned systems. It is hard to study experimentally and there is not yet consensus about its exact binary phase diagram.…”