| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Soft Magnets and Magnetocaloric Materials: An FMD Symposium in Honor of Victorino Franco
|
| Presentation Title |
Essential Perspective on Magnetic and Thermodynamical States of Fe-based Magnetocaloric Compounds Inside the AMR-type Module |
| Author(s) |
Asaya Fujita |
| On-Site Speaker (Planned) |
Asaya Fujita |
| Abstract Scope |
Despite its exceptional efficacy, operating principle of magnetic materials in the active magnetic regenerative (AMR) – type cycle is not thoroughly understood. Especially, gap is stark between thermodynamical design and materials performance. There is no isothermal field-induced segment in an ideal AMR cycle, while the materials benchmark is still compared with isothermal field induced entropy change ΔS<sub>M</sub>. Also, only the temperature change of material is measured for an adiabatic process, and the information for magnetic state change is neglected in general. In this study, the initial/final magnetic states of the adiabatic process were observed by adopting the AC susceptibility technique, and their positions on a S-T diagram were assigned. Characteristic feature appeared under the adiabatic process different from the equilibrium process. The transient passes of the magnetic state were predicted by using the Landau expansion model. Further magnetic state change during hot/cold brow following the adiabatic process was also detected. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Phase Transformations, Other |