Noncollinear magnetic order in epitaxial thin films of the centrosymmetric MnPtGa hard magnet

Magnetic systems exhibiting spin-canted states have garnered much attention recently for their promising rich exotic properties driven by the real-space spin textures and competing magnetic orders. In this study, we present the structural and magnetic properties of hexagonal 60 nm MnPtGa epitaxial thin films grown by magnetron sputtering on Al 2 O 3 (0001) single-crystalline substrates. The MnPtGa film crystallizes in the centrosymmetric P6 3 / mmc (No. 194) space group, showing perpendicular magnetic anisotropy along the c-axis, with a Curie temperature T C  = 263 K. In addition, the MnPtGa film undergoes a spin reorientation transition at T sr  = 160 K. We investigated the MnPtGa magnetic ground states using single-crystal neutron diffraction. A structurally forbidden (001) magnetic Bragg reflection emerges below T sr , indicating the existence of a spin-canted state, where the magnetic moments align ferromagnetically perpendicular to the basal plane, and a non-zero in-plane component exhibits an antiferromagnetic ordering along the c-axis. At 2 K, the refined magnetic moments of Mn are μ z  = 4.2(4)  μ B and μ x  = 1.5(3)  μ B , projected onto the c-axis and basal plane, respectively. Hence, we determined a 20° Mn spin canting angle off from the c-axis.