Magnetotransport Properties of Thin Ni49.7Fe17.4Co4.2Ga28.7 Films

Intrinsic anomalous Hall conductivity and real space Berry curvature induced topological Hall effect in Ni2MnGa magnetic shape memory alloy

“…Therefore, Ni 2 MnGa is expected to show THE. Interestingly, THE has been observed in the film of Ni 47.3 Mn 30.6 Ga 22.1 (composition close to Ni 2 MnGa) [56]. However, the authors claimed that THE is not related to the skyrmions in Ni 2 MnGa [56].…”

“…Interestingly, THE has been observed in the film of Ni 47.3 Mn 30.6 Ga 22.1 (composition close to Ni 2 MnGa) [56]. However, the authors claimed that THE is not related to the skyrmions in Ni 2 MnGa [56]. Their claim was based on topological Hall resistivity's sign, magnitude, and temperature dependency [56].…”

“…Mn 2 NiGa [21] and Mn-Pt(Pd/Rh)-Sn [22,[46][47][48]. Interestingly, skyrmions have also been observed in the centrosymmetric Ni 2 MnGa Heusler compound [37], which exhibits magnetic shape memory effect [49,50] and several other fundamental properties like giant negative magnetoresistance (MR) [51][52][53], large magnetocaloric effect [54,55], AHE [56,57], anomalous Nernst effect [58], etc. The stoichiometric Ni 2 MnGa magnetic shape memory alloy (MSMA) shows both FM and ferroelastic (martensite and premartensite) phase transitions [59,60].…”

“…However, the authors claimed that THE is not related to the skyrmions in Ni 2 MnGa [56]. Their claim was based on topological Hall resistivity's sign, magnitude, and temperature dependency [56]. Thus, the ongoing discussion suggests that there is a controversy about the presence of skyrmion in Ni 2 MnGa MSMA.…”

“…Thus, the ongoing discussion suggests that there is a controversy about the presence of skyrmion in Ni 2 MnGa MSMA. Apart from the controversy of THE, the mechanism of AHE is also not well understood in these MSMAs [6,56]. Therefore, a detailed study of Hall effect in Ni 2 MnGa MSMA is still required.…”