外延亚铁磁Fe3O4薄膜中面相关的磁振子极化子
Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films
摘要：
磁振子极化子是磁有序材料中晶格振动和自旋波的强磁弹性耦合产生的相干混合准粒子。磁振子极化子是磁振子自旋电子器件中必不可少的一个重要组成部分，它为磁振子的操纵提供了一个强有力的工具，近年来引起了人们的广泛关注。在这项工作中，我们报道了通过自旋塞贝克效应测量在外延铁磁Fe 3 O 4薄膜中实验观察到的依赖于晶面的磁振子极化子。在（110）和（100）取向的Fe_3O_4薄膜中，磁振子极化子的临界磁场分别为1.5 T和1.8 T，这是由于沿[110]和[100]方向的声子速度不同造成的。随着温度的降低，（110）和（100）取向的Fe3O4薄膜中磁振子极化子增强的自旋Seebeck电压降低，这可能是由于温度升高时磁振子极化子散射增强所致.这项工作表明，在外延磁性薄膜的晶体结构工程作为一个有前途的路线来操纵未来的磁振子自旋电子学应用的磁振子极化子。
英文摘要：
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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