About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
MnBi Thin Film Micromagnets with Tunable Anisotropy for High Temperature Applications |
Author(s) |
M. Villanueva, E. H. Sánchez, P. Pedraz, P. Olleros, P. Perna, P. S. Normile, C. Navío, J. Camarero, Jose A. De Toro, A. Bollero |
On-Site Speaker (Planned) |
Jose A. De Toro |
Abstract Scope |
The low temperature phase (LTP) of MnBi, with hexagonal crystal structure, is receiving increasing attention due to its high magnetic anisotropy and Curie temperature, as well as to the outstanding increase in coercivity with temperature. LTP-MnBi microcrystals of different size have been prepared as (quasi-) hexagonal islands by RF-magnetron sputtering of composite targets. AFM shows crater-like shapes, which allows for a facile study of the domain configuration as a function of thickness. The microcrystals, grown at 300 K, exhibit perpendicular anisotropy with coercive fields (up to 10.7 kOe) dependent on the substrate temperature during deposition. Higher deposition temperatures (475 K) yield rods lying on the substrate displaying in-plane anisotropy with a remarkable coercivity of 20 kOe at 400 K. Thus, the magnetic anisotropy can be tuned without applied external fields. Finally, ongoing efforts on the dispersion of high saturation magnetization FeCo nanoparticles in the above material will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnetic Materials, Thin Films and Interfaces, High-Temperature Materials |