| Title | Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films |
| Authors | Xing, Wenyu Ma, Yang Yao, Yunyan Cai, Ranran Ji, Yuan Xiong, Richen Shen, Ka Han, Wei |
| Affiliation | Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China Beijing Normal Univ, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China |
| Issue Date | 13-Nov-2020 |
| Publisher | PHYSICAL REVIEW B |
| 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 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. |
| URI | http://hdl.handle.net/20.500.11897/599474 |
| ISSN | 2469-9950 |
| DOI | 10.1103/PhysRevB.102.184416 |
| Indexed | SCI(E) |
| Appears in Collections: | 量子材料科学中心 |
