Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Magnetic Heuslers

MA 42.5: Vortrag

Freitag, 9. September 2022, 12:30–12:45, H48

Noncollinear magnetic order in epitaxial thin films of the MnPtGa hard magnet — •Rebeca Ibarra^1,2, Edouard Lesne¹, Bachir Ouladdiaf³, Ketty Beauvois³, Alexandr Sukhanov², Rafal Wawrzyńczak¹, Walter Schnelle¹, Anton Devishvili³, Dmytro Inosov², Claudia Felser¹, and Anastasios Markou¹ — ¹Max-Planck-Institute für Chemische Physik fester Stoffe, D-01187 Dresden, Germany — ²Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany — ³Institut Laue-Langevin, CS20156, 38042 Grenoble Cedex 9, France

Noncollinear magnetism has attracted great attention in the recent years and promise rich exotic properties with potential for spintronic applications. In this work, we present a detailed analysis of the structural and magnetic properties of high-quality thin films of the hexagonal MnPtGa hard magnet grown on Al₂O₃(0001) substrates. The films crystalize in the P6₃/mmc space group, with an ordering temperature of T_C = 263 K into a ferromagnetic (FM) state, followed by a spin reorientation transition at T_sr ∼ 160 K. A large uniaxial magnetic anisotropy is observed in this centrosymmetric compound. We further investigate the magnetic transitions by single-crystal neutron diffraction at zero applied magnetic field. The emergence of the structurally forbidden (001) Bragg reflection for T < 160 K, unequivocally determines a transition to a spin canted state, where the Mn magnetic moments align ferromagnetically along the c-axis and antiferromagnetically in the basal plane, resulting in a spin canting angle of 20^∘ respect to the c-axis.