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arXiv · 2011.00195

Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films

Wenyu Xing·Yang Ma·Yunyan Yao·Ranran Cai·Yuan Ji·Richen Xiong·Ka Shen·Wei Han
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Abstract

Magnon-polarons are coherently mixed quasiparticles that originate from the strong magnetoelastic coupling of lattice vibrations and spin waves in magnetic-ordered materials. Recently, magnon-polarons have attracted a lot of attention since they provide a powerful tool to manipulate magnons, which is essential for magnon-based spintronic devices. In this work, we report the experimental observation of facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films via spin Seebeck effect measurement. The critical magnetic fields for the magnon-polarons in the (110)- and (100)-oriented Fe3O4 films are 1.5 T and 1.8 T, respectively, which arises from the different phonon velocities along the [110] and [100] directions. As the temperature decreases, the magnon-polarons-enhanced spin Seebeck voltage decreases in both (110)- and (100)-oriented Fe3O4 films, which could be attributed to the enhanced magnon-polarons scattering at elevated temperatures. This work demonstrates the crystal structure engineering in epitaxial magnetic films as a promising route to manipulate the magnon-polarons for future magnon spintronic applications.

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Wenyu Xing, Yang Ma, Yunyan Yao, Ranran Cai, Yuan Ji, Richen Xiong, Ka Shen, Wei Han. 2020-10-31. Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films. https://doi.org/10.1103/physrevb.102.184416

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