Unusual magnetic and electronic properties of Al-substituted Ga2MnNi: An ab initio study

Single-domain Fe2CoGa0.5Al0.5 Heusler alloy nanoparticles with enhanced properties

“…−1 ), 20 it has intermediate value between those of the end compositions. Similar variation in M t was observed by Chakrabarti et al 9 while investigating NiMnGa 2− x Al x alloys. The magnetic field versus magnetization ( M – H ) curves of the Fe 2 CoGa 0.5 Al 0.5 nanoparticles shown in Fig.…”

“…Comparison of the a obtained for Fe 2 CoGa 0.5 Al 0.5 nanoparticles with the previously reported a values of similar sized Fe 2 CoGa (5.764 Å with D v of 42 nm) and Fe 2 CoAl (5.723 Å with D v of 41 nm) 20 nanoparticles, show a decreasing trend in a with increasing Al content. Similar trend was observed in bulk Ru 2 VGa x Al 1− x (0 ≤ x ≤ 1) alloys, 8 NiMnGa 2 –NiMnAl 2 alloys, 9 and Fe 50 Mn 25 Ga x Al 25− x (0 ≤ x ≤ 10) HA. 11 Mishra et al 11 correctly attributed this behavior to the difference in the atomic radii of Ga and Al.…”

“…While it is relatively easy to prepare bulk quaternary HA by arc melting, it is extremely difficult to prepare quaternary HA nanoparticles with desired stoichiometry. Thus one can find only a few reports on bulk quaternary Heusler alloys containing s–p elements Ga and Al, say, Cu 50 Mn 25 Ga x Al 25− x (0 ≤ x ≤ 10), 7 Ru 2 VGa x Al 1− x (0 ≤ x ≤ 1), 8 NiMnGa 2− x Al x (0 ≤ x ≤ 2), 9 Fe 2 MnGa 1− x Al x (0 ≤ x ≤ 1), 10 and Fe 50 Mn 25 Ga x Al 25− x (0 ≤ x ≤ 10) 11 etc. alloys in the literature, with none pertaining to investigations on nanoparticles.…”