• DOI:10.1103/PhysRevB.102.184416
• Corpus ID: 226227318

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

@article{Xing2020FacetdependentMI,
  title={Facet-dependent magnon-polarons in epitaxial ferrimagnetic 
Fe3O4
 thin films},
  author={Wenyu Xing and Yang Ma and Yunyan Yao and Ranran Cai and Yuan Ji and Richen Xiong and Ka Shen and Wei Han},
  journal={Physical Review B},
  year={2020},
  volume={102}
}

• Wenyu Xing, Yang Ma, +5 authors W. Han
• Published 31 October 2020
• Physics, Materials Science
• Physical Review B

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.