About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
E-7: Tuning of Second Order Phase Transition of NiMnGa Heusler-type Glass-coated Microwires |
Author(s) |
Carlos Garcia, Valentina Zhukova, Sergei Shevyrtalov, Mihail Ipatov, Paula Corte-Leon, Arcady Zhukov |
On-Site Speaker (Planned) |
Arcady Zhukov |
Abstract Scope |
The conventional preparation method of Heusler alloys is arc-melting followed by long high temperature annealing. Recently rapidly quenching technique has been successfully employed for the Heusler-type ribbons and wires preparation.
The magnetic hysteresis that appears for first-order phase transitions may reduce the actual efficiency of the cooling process. Therefore, studies of the materials exhibiting the second-order phase transitions with a broader peak in the magnetic entropy change have attracted attention.
We present our results on the tuning of the second-order phase transitions in Heusler-type NiMnGa glass—coated microwires prepared using Taylor-Ulitovsky method by annealing at temperatures ranging from 550 up to 750 oC..
The temperature dependence of magnetization, M(T), as well as the corresponding Curie temperatureare considerably affected by the annealing conditions (annealing temperature and duration).
Mixing of glass-coated microwires annealed at different conditions within the same bunch allows tuning of M(T) dependence and hence obtain broader second-order phase transition. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |