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SYMM: Symposium Magic MAX Phases: Self-healing, Magnetism and the Next Best Graphene

SYMM 1: Magic MAX Phases: Self-healing, Magnetism and the next best Graphene

SYMM 1.4: Hauptvortrag

Donnerstag, 19. März 2015, 11:30–12:00, H 0105

Magnetic MAX phases from first principles and thin film synthesis — •Johanna Rosen — Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden

Inherently layered magnetic materials, such as magnetic MAX phases, offer an intriguing perspective for use in spintronics applications and as ideal model systems for fundamental studies of complex magnetic phenomena. These phases were discovered from an approach based on predictions from theoretical procedures in combination with thin film synthesis and characterization. Using density functional theory and evaluation of phase stability, the first magnetic MAX phases were obtained from alloying Cr2AlC, Cr2GeC, and Cr2GaC with Mn. The materials were synthesized as heteroepitaxial thin films, and were found to have a variety of magnetic properties, including a displayed ferromagnetic response well above room temperature. Advancing beyond alloying, the more recently discovered magnetic Mn2GaC MAX phase displays pronounced structural changes linked to the magnetic anisotropy, and a rich magnetic phase diagram which can be manipulated through temperature and magnetic field. These results indicate that the magnetic state can be directly controlled by an applied pressure or through the introduction of stress. Ongoing research expand the family of magnetic MAX phases, and the different isostructural compositions suggest that they can be combined in a variety of heterostructures, thus making them ideal for the study of the complex magnetism that occur in layered materials.