Aalen University, Materials Research Institute, Beethovenstr. 1, 73430 Aalen, Germany
Abstract:
The race for discovering materials with properties beyond Fe-Nd-B and with better available RE metals, reduced RE content or RE free has started recently. In consideration of the fact that the number of so far unexplored higher component alloy systems is rather large, there is best hope to discover such a material one day. However, as traditional system-on-system investigation takes about 2-3 years per system, it looks like looking for a needle in a haystack to find candidates for a novel pm in a reasonable time period. To make the screening efficient, an elaborate concept is therefore necessary.
To scan quickly through higher component systems we have developed suitable high-throughput approaches which are based on heterogeneous non-equilibrium states, so that one sample may be sufficient to cover the most relevant part of a phase diagram [1]. The efficiency of the high-throughput method is first demonstrated for known systems. To identify the magnetic phases and analyze their intrinsic material parameters (anisotropy constant K1, saturation polarization Js, Curie temperature Tc) a combination of optical microscopy, Kerr microscopy and energy dispersive X-ray analysis in a scanning electron microscope is used. This allows to estimate K1 and Js from domain size and domain contrast. It is shown that the high-throughput method can be successfully applied to discover novel phases for permanent magnets.
The work is funded by the German Federal Ministry of Education and Research.
[1] D. Goll, R. Loeffler, J. Herbst, R. Karimi, G. Schneider, High-throughput search for new permanent magnet materials, J. Phys.: Condens. Matter 26 (2014) 064208.
To scan quickly through higher component systems we have developed suitable high-throughput approaches which are based on heterogeneous non-equilibrium states, so that one sample may be sufficient to cover the most relevant part of a phase diagram [1]. The efficiency of the high-throughput method is first demonstrated for known systems. To identify the magnetic phases and analyze their intrinsic material parameters (anisotropy constant K1, saturation polarization Js, Curie temperature Tc) a combination of optical microscopy, Kerr microscopy and energy dispersive X-ray analysis in a scanning electron microscope is used. This allows to estimate K1 and Js from domain size and domain contrast. It is shown that the high-throughput method can be successfully applied to discover novel phases for permanent magnets.
The work is funded by the German Federal Ministry of Education and Research.
[1] D. Goll, R. Loeffler, J. Herbst, R. Karimi, G. Schneider, High-throughput search for new permanent magnet materials, J. Phys.: Condens. Matter 26 (2014) 064208.