Deriving Snell's Law Using Fermat's Principle and the Method of Substitution
Snell’s Law is often introduced as a formula to memorize. In reality, it captures a deep physical principle about how light chooses its path when moving between materials.
Physics
New Paper: Role of twin and anti-phase defects in MnAl permanent magnets
Our latest paper has just been published in the journal Acta Materialia. In it, we compare finite element micromagnetics simulations to experimental evidence in order to investigate the role of twin and anti-phase defects in the reduction of performance in MnAl permanent magnets. Figure: Room temperature (BH) max as a function of approximate raw material costs for the theoretical MnAl permanent magnet and experimental values for a selection of common commercial permanent magnets. The raw material costs are a good indication of the relative cost of the manufactured magnets. ...