About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
Magneto-Thermoelectric Properties in FeRh Thin Films during Antiferromagnetic-Ferromagnetic Phase Transition |
Author(s) |
Mona Zebarjadi, Sabbir Akhanda, Sourav Das, Steven Bennett, Sang-Kwon Lee |
On-Site Speaker (Planned) |
Mona Zebarjadi |
Abstract Scope |
FeRh, exhibits a first-order antiferromagnetic- ferromagnetic phase transition near room temperature. We explore the magneto-thermoelectric properties including the resistivity, Seebeck, Nernst, and Thomson coefficients in near equimolar FeRh thin films grown on three different substrates namely, sapphire, SiO2, and MgO. The phase transition temperature and its range are influenced by the substrate, which can impose compressive or tensile stress, thereby affecting the quality of the thin films. We show that the substrate-induced stress in these thin films results in variations in the sign of the Seebeck coefficient in antiferromagnetic phase. The larger magnitude enhancement of the Seebeck coefficient in the ferromagnetic phase is attributed to its larger density of states. We discuss the relation between the crystal quality and the Thomson response in FeRh thin films. We report a larger Nernst thermopower in the ferromagnetic phase and explain the unusual sign change of the Nernst coefficient with respect to temperature. |