The bimodal distribution spin Seebeck effect enhancement in epitaxial Ni0.65Zn0.35Al0.8Fe1.2O4 thin film

Hua Wang, Dazhi Hou, Takashi Kikkawa, Rafael Ramos, Ka Shen, Zhiyong Qiu, Yao Chen, Maki Umeda, Yuki Shiomi, Xiaofeng Jin, Eiji Saitoh

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The temperature dependence of the spin Seebeck effect (SSE) in epitaxial Ni0.65Zn0.35Al0.8Fe1.2O4 (NZA ferrite) thin film has been investigated systematically. The SSE at high fields shows a bimodal distribution enhancement from 3 K to 300 K and is well fitted with a double-peak Lorentzian function. We speculate the symmetric SSE enhancement in Pt/NZA ferrite bilayer, which is different from the magnon polarons induced asymmetric spikes in the SSE of Pt/YIG [T. Kikkawa et al. Phys. Rev. Lett. 117, 207203 (2016)], may result from the magnon-phonon interactions occurring at the intersections of the quantized magnon and phonon dispersions. The SSE results are helpful for the investigation of the magnon-phonon interaction in the magnetic ultrathin films.

Original languageEnglish
Article number142406
JournalApplied Physics Letters
Issue number14
Publication statusPublished - 2018 Apr 2

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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