| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2024: Process-Structure-Property Relations and New Technologies
|
| Presentation Title |
Magnon-phonon Hybrid Enhances Function in a Magnetic Shape Memory Alloy |
| Author(s) |
Michael E. Manley, Paul Stonaha, Ibrahim Karaman, Raymundo Arroyave, Songxue Chi, Douglas Abernathy, Jeffrey Lynn |
| On-Site Speaker (Planned) |
Michael E. Manley |
| Abstract Scope |
Heusler alloys exhibit magnetic-field-induced shape memory and
large magnetocaloric effects, which make them promising for applications such as magnetic refrigeration. These properties are driven by strong magnon-phonon coupling, and theory predicts magnetic fields reverse the shape-memory transition by stabilizing phonons in the austenite phase below the martensitic phase transformation temperature. However, the coupling mechanism in experiments has been unclear, as the shifting phonons are remote from the magnon dispersion curves. We find that strong coupling in Heusler alloy Ni45Co5Mn36.6In13.4 is facilitated by a localized hybrid mode acting as a bridge between phonons and magnons using neutron scattering as a function of temperature and magnetic field. Our findings shed light on the complex interplay between magnons, phonons, and disorder, and how it enhances magnetocaloric and magnetic shape memory properties. Revealing the
underlying mechanisms will enable the functional properties of such alloys to be improved for applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Magnetic Materials, Phase Transformations |