|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials: An FMD Symposium in Honor of Michael E. McHenry
||Magnetocaloric Effects in Ni-Mn-Al Type Alloys
||Robert D. Shull, Daniel Lepkowski, Cindi L Dennis, Adam Creuziger, Anit K Giri
|On-Site Speaker (Planned)
||Robert D. Shull
Ni45Co5-xFexMn32Al18 (x=0-5) alloys are of particular interest as potential magnetic refrigerants because of their possessing a field-induced crystallographic transformation which along with their Curie temperature can be adjusted by appropriate composition changes. In this study we report the effects of their crystallography on their magnetocaloric effects (MCE), cooling power and magnetic hysteresis. The x=5 sample was effectively a single crystal and showed no hysteresis (within experimental error); in contrast, the x=2.5 sample was composed of approximately 14 crystals and showed a small amount of hysteresis. As first reported by our group, large magnetic hysteresis losses (commonly found in materials having a field-induced crystallographic phase change) are deleterious to the usefulness of the material as a magnetic refrigerant and must, therefore, always be reported and subtracted from the material’s calculated cooling power when comparing magnetic refrigerants.
 V. Provenzano, A.J. Shapiro, & R.D. Shull, Nature 429, 853 (2004).
||Planned: None Selected