Magnon drag effect in Fe-Co alloys
Abstract
We report here a systematic study of the magnon-drag induced thermoelectric properties of Fe-rich, Fe-Co body-centered-cubic alloys. The sign of the low temperature behavior of thermopower is explained well by the hydrodynamic theory for magnon-drag, informed by density functional theory calculations of the ground state of Fe-Co alloys. The high-temperature thermopower of some of the alloys, and indeed that of elemental iron, changes the sign, as previously observed. We propose a mechanism to elucidate this hitherto unexplained observation. Further, the power factor of Fe72Co28 peaks around 35 μV/cm K2 at 500 K, comparable to the standard thermoelectric material Bi2Te3. Because of their high thermoelectric power factor, Fe-Co alloys are potential candidate thermoelectric metals for active cooling of electronic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 25, 2019
- Source ID
- 10.1063/1.5117165
Entities
People
- Elan Weiss
- Joseph P. Heremans
- Nikolas Antolin
- Wolfgang Windl
- Yuanhua Zheng
Organizations
- Army Research Office
- National Science Foundation
- Ohio State University