| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron and X-ray Scattering in Materials Science and Engineering
|
| Presentation Title |
Enhanced Magnetic-Disorder Driven Magnon Softening of TbSb via Y-Doping |
| Author(s) |
George Yumnam, David Dahlbom, Duncan H Moseley, Hasitha S Arachige, Barry Winn, Allen Scheie, Wei Tian, Michael Manley, David Mandrus, Raphael P Hermann |
| On-Site Speaker (Planned) |
George Yumnam |
| Abstract Scope |
Magnetic systems with a cubic crystal structure, such as TbSb, offer a simple yet effective platform for studying magnetic disorder via doping with a non-magnetic element, such as yttrium. Y-doping reduces the Néel temperature in TbSb and enables studying the interplay of disorder and magnetic excitations as a function of doping concentration. We study the effect of disorder on the magnetic excitations as function of Y-doping in TbSb by combining inelastic neutron scattering and multiflavor generalized SU(N) based spin wave theory (LSWT). Increasing the doping soften and broaden the magnons in TbSb until the percolation threshold in Tb0.6Y0.4Sb, where the system no longer remains antiferromagnetic. Numerical simulation of the spin waves in TbSb based on LSWT and classical spin dynamics reveal the transformation of spin waves and crystal field excitation as a function of Y-doping. Our study provides new insights into the behavior of magnons in disordered magnetic materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Phase Transformations, |