title: Room-temperature tetragonal non-collinear Heusler antiferromagnet Pt2MnGa.
abstract: Antiferromagnetic spintronics is a rapidly growing field, which actively introduces new principles of magnetic storage. Despite that, most applications have been suggested for collinear antiferromagnets. In this study, we consider an alternative mechanism based on long-range helical order, which allows for direct manipulation of the helicity vector. As the helicity of long-range homogeneous spirals is typically fixed by the Dzyaloshinskii-Moriya interactions, bi-stable spirals (left- and right-handed) are rare. Here, we report a non-collinear room-temperature antiferromagnet in the tetragonal Heusler group. Neutron diffraction reveals a long-period helix propagating along its tetragonal axis. Ab-initio analysis suggests its pure exchange origin and explains its helical character resulting from a large basal plane magnetocrystalline anisotropy. The actual energy barrier between the left- and right-handed spirals is relatively small and might be easily overcome by magnetic pulse, suggesting Pt2MnGa as a potential candidate for non-volatile magnetic memory.
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: Sanjay
authors: S
authors: Singh
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: S W
authors: SW
authors: D'Souza
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: J
authors: J
authors: Nayak
authors: Institut Laue-Langevin, BP 156, Grenoble Cedex 9 38042, France.
authors: E
authors: E
authors: Suard
authors: Institut Laue-Langevin, BP 156, Grenoble Cedex 9 38042, France.
authors: L
authors: L
authors: Chapon
authors: Forschungsneutronenquelle Heinz Maier-Leibnitz FRM-II, Technische Universität München, Lichtenbergstrasse 1, Garching 85747, Germany.
authors: A
authors: A
authors: Senyshyn
authors: Department of Structure Analysis, Institute of Physics ASCR, Na Slovance 2, Praha 18221, Czech Republic.
authors: V
authors: 0000-0002-9731-8730
authors: V
authors: Petricek
authors: Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden D-01328, Germany.
authors: Y
authors: Y
authors: Skourski
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: M
authors: 0000-0001-6272-2162
authors: M
authors: Nicklas
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: C
authors: C
authors: Felser
authors: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden D-01187, Germany.
authors: S
authors: S
authors: Chadov