| Modeling and Analyzing Magneto-caloric Effect in Heusler Alloys Heusler alloys feature both conventional and inverse magnetocaloric effects (MCE) near room temperature as they undergo two different transitions. In order to properly characterize these alloys, the mechanism of the transformations that accompanies the MCE peaks must be understood. These alloys have interesting magnetic behavior that can be modeled and predicted. Modeling the cluster compositions in the mixed-state regions, where two stable magnetic states co-exist, provides a perspective for enhancing the MCE effect through chemical substitution or similar process.;By using a reliable mechanism for evaluating the magnetic characteristics, the material's behavior can be characterized based on the results of testing in relatively few applied fields, significantly reducing testing effort required when characterizing materials. Also by applying a few critical points in testing, the most accurate testing results can be achieved.;In order to better utilize these magnetic materials, material composition must be improved to provide desired behavior with respect to magnetocaloric effect. By understanding the elemental contribution, the sample can be better tuned in composition to gain the desired behavior. Tuning behavior will result in a more useful composition and serve to further the overall research.;This dissertation will contribute to the study of Heusler alloys for usage in magnetic refrigeration in the following areas. First, it will improve the self-similarity method for analyzing and evaluating the test data. By improving the method for analysis, it will also lead to a simplified testing process. Second, it will use the new analysis to understand the elemental contribution of specific elements added to Heusler alloys. Finally, it will increase the overall understanding of the magnetocaloric behavior of Heusler alloys. |
