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MA: Fachverband Magnetismus

MA 52: Magnetic Materials IV

MA 52.3: Vortrag

Freitag, 4. April 2014, 10:00–10:15, HSZ 403

Anisotropy Measurements on YCo₅ and (Y,X)(Co,Z)₅ materials at various temperatures — •Christoph Andreas Schwöbel, Michael Kuzmin, Konstantin Skokov, and Oliver Gutfleisch — TU Darmstadt, Materialwissenschaften, 64287 Darmstadt

The presented work is part of the ROMEO consortium (abbrev. for Replacement and Original Magnet Engineering Options), which is supported by the seventh framework program of the European Union. One objective is to remove, or greatly reduce, the need for heavy rare earths in high performance permanent magnets by novel microstructural engineering strategies. The other goal is to develop a magnet containing no rare earth at all. Both strategies aim at drastically reducing Europe’s dependence on rare earth supplies from China.
This work focuses on heavy rare earth free, highly anisotropic materials, which potentially exhibit a high coercivity, if manufactured into a magnet. Materials of the CaZn₅-type are investigated. They show high anisotropy constants due to their hexagonal crystal structure. These constants were measured in a high field PPMS at various temperatures on single crystals. Based on our first measurements on YCo₅, we grew single crystals modifying both the Y and the Co site with other elements and systematically investigated the anisotropy, magnetization and Curie temperature.