About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Engineering Built-in strain Gradients to Tune Magnetism in Two-phase Heusler Intermetallics |
Author(s) |
Yolita M. Eggeler, Emily Levin, Fulin Wang, Ram Seshadri, Tresa Pollock, Daniel Gianola |
On-Site Speaker (Planned) |
Yolita M. Eggeler |
Abstract Scope |
It has recently been proposed that magnetic properties may be influenced by built-in strain gradients arising from the two-phase microstructure in phase separated Heusler intermetallics. The different lattice parameter of the matrix phase and the precipitate phase results in a lattice misfit at the precipitate/matrix interface, which introduce strain gradients in the compound and locally disrupt the crystal symmetry. We hypothesize that built-in strain gradients in two-phase Heusler systems can be engineered to directly mediate magnetic bulk properties and result in emergent magnetic spin texture formations. This work characterizes semi-coherent interfaces in the Nb-Co-Sn two-phase Heusler system. Our results show that the rather large lattice misfit of 3.3% causes a regular array of dislocation pairs, which line up along the precipitate/matrix interface with nanometer separation. Different thermal processing routes are applied to elucidate how this interface structure can be tailored to influence functional properties mediated by magnetic structure. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |