Permanent magnets by nanoscale phase decomposition


Currently, the achievable coercivities in permanent magnet materials do not surpass 20 % of their intrinsic limits imposed by the respective anisotropy fields. To address this, we focus in A01 on realizing maximum hysteresis in permanent magnets by new strategies for magnetic hardening. A novel top-down approach that exploits phase decomposition reactions leading to nanocomposite microstructures with domain wall pinning sites (“perfect defects”) in Nd2Fe14B will be demonstrated for the first time. In a perspective, we pursue an additional strategy where exchange coupling between a ferromagnetic matrix and antiferromagnetic precipitates results in a large coercivity. This is developed based on the concept of exploiting the relatively high exchange energy, as compared to the anisotropy energy.


  Name Contact
Prof. Dr. Oliver Gutfleisch
Prof. Dr. Oliver Gutfleisch
+49 (0)6151 16-22150
L207 111
Picture: Functional Materials
M.Sc. Lukas Schäfer
+49 (0)6151 16-22155
L2|07 108