Magneto-thermal transport indicating enhanced Nernst response in FeCo/IrMn exchange coupled stacks

0565568 - FZÚ 2023 RIV US eng J - Journal Article
Martini, M. - Reichlová, Helena - Lee, Y. - Dusíková, D. - Zemen, J. - Nielsch, K. - Thomas, A.
Magneto-thermal transport indicating enhanced Nernst response in FeCo/IrMn exchange coupled stacks.
Applied Physics Letters. Roč. 121, č. 21 (2022), č. článku 212405. ISSN 0003-6951. E-ISSN 1077-3118
Institutional support: RVO:68378271
Keywords : Nernst effect * exchange bias * thin film * transport measurement
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4, year: 2022
Method of publishing: Open access

We present an analysis of magneto-thermal transport data in IrMn/FeCo bilayers based on the Mott relation and report an enhancement of the Nernst response in the vicinity of the blocking temperature. We measure all four transport coefficients of the longitudinal resistivity, anomalous Hall resistivity, Seebeck effect, and anomalous Nernst effect, and we show a deviation arising around the blocking temperature between the measured Nernst coefficient and the one calculated using the Mott rule. We attribute this discrepancy to spin fluctuations at the antiferromagnet/ferromagnet interface near the blocking temperature. The latter is estimated by magnetometry and magneto-transport measurements.
Permanent Link: https://hdl.handle.net/11104/0337090