About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Computational Design of Bulk Permanent Magnets |
Author(s) |
Thomas Schrefl, Johann Fischbacher, Alexander Kovacs |
On-Site Speaker (Planned) |
Thomas Schrefl |
Abstract Scope |
With modern production technologies of permanent magnets such as additive manufacturing or grain boundary diffusion, the coercivity field can be adapted locally. In many applications, partial demagnetization reduces the performance of the magnet with increasing operating time. We combine magnetostatic field computation, micromagnetics and machine learning to identify regions where the local coercive field needs to be strengthened. We calculate energy barriers for magnetization reversal at different locations within the magnet, taking into account the distribution of the magnetostatic field. As a result, we obtain a map of the cumulative operating time before demagnetization. For example, in an external field of 0.8 T/μ0 at 300 K, a Nd2Fe14B magnet of 2x2x0.4cm3 demagnetizes after 1230 hours near the edge. At 450 K edge demagnetization occurs within a few minutes in an external field of 50 mT/μ0. The simulation of local magnetization reversal events guides the design of permanent magnets. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |