Analysis of Magnetization Reversal Process of Nd–Fe–B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope
We used a Kerr microscope, image processing, and photo editing to clarify magnetization reversal and its propagation in a sintered Nd-Fe-B magnet. Magnetic domain change was observed when a dc field from +20 to 20 kOe was applied to a sintered Nd-Fe-B magnet. Simultaneous magnetization reversal in several grains along the easy axis direction and its propagation to neighboring grains occurred. This indicates that the nucleation field in a grain and magnetic interaction between grains are important controlling factors of the coercivity of sintered Nd-Fe-B magnets.
Analysis of the demagnetization process of Nd–Fe–B sintered magnets at elevated temperatures by magnetic domain observation using a Kerr microscope
Magnetization reversal and its propagation in sintered Nd–Fe–B magnets were clearly observed at elevated temperatures up to 150 °C using a Kerr microscope, image processing, and photo editing. Simultaneous magnetization reversal in several grains along the easy axis direction occurred at elevated temperature, and the extent of simultaneous magnetization reversal increased with temperature. This indicates that reduction in the coercivity of Nd–Fe–B sintered magnets at elevated temperatures is attributable to decrease in anisotropy and insufficient pinning of domain walls at grain boundaries.
Gender and History in Medieval English Romance and Chronicle
New York, Bern, Berlin, Bruxelles, Frankfurt/M., Oxford, Wien. This reading of canonical texts of medieval English literature - Sir Gawain and the Green Night and Chaucer's Man of Law's Tale - alongside Geoffrey of Monmouth's Historia regum Britanniae and other Anglo-Norman and English chronicles offers a broader context for reading the romance narratives and re-evaluates romance conventions in light of the genealogical priorities of these chronicles. By arguing that maternity is featured as a position of power, Gender and History in Medieval English Romance and Chronicle adds to our understanding of women and sovereignty, and the ways gender and authority were rhetorically linked to medieval texts.