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Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements by Yan, Xiaoxian; Huai, Chang; Xing, Hui; Parry, James P.; Yang, Yusen; Tang, Guoxiong; Yao, Chao; Hu, Guohan; Sabirianov, Renat; Zeng, Hao is a scholarly article available to read on EtoBox.

What is Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements about?

We report unconventional thermoelectric power (Seebeck coefficient, S) in L10 structured FePt films. The temperature dependence of S can be well fitted by a phenomenological expression consisting of electron diffusion and magnon-drag contributions. Interestingly, the magnon drag coefficient carries an opposite sign to that of electron diffusion, revealing a dominant contribution from the elusive electron-magnon Umklapp scattering. DFT calculations identify several bands crossing the Brillouin zone boundaries, facilitating the Umklapp process. The large spin-orbit coupling in FePt results in strong mixing of majority and minority spins among some of those bands, greatly enhancing the electron-magnon scattering.

Author

Yan, Xiaoxian; Huai, Chang; Xing, Hui; Parry, James P.; Yang, Yusen; Tang, Guoxiong; Yao, Chao; Hu, Guohan; Sabirianov, Renat; Zeng, Hao

Published

2013

Language

EN