We measure the mode-resolved direction of the precessional motion of the magnetic order, i.e., magnon polarization, via the chiral term of inelastic polarized neutron scattering spectra. The magnon polarization is a unique and unambiguous signature of magnets and is important in spintronics, affecting thermodynamic properties such as the magnitude and sign of the spin Seebeck effect. However, it has never been directly measured in any material until this work. The observation of both signs of magnon polarization in ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ also gives direct proof of its ferrimagnetic nature. The experiments agree very well with atomistic simulations of the scattering cross section.

中文翻译：

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磁振子极化的观察。

我们通过非弹性极化中子散射谱的手征项来测量磁阶进动运动的模式分辨方向。磁振极化是磁体的唯一且明确的特征，在自旋电子学中很重要，会影响热力学特性，例如自旋塞贝克效应的大小和符号。但是，直到进行这项工作之前，从未在任何材料中对其进行直接测量。观测磁振子极化的两个征兆${\mathrm{ÿ}}_3{铁}_5{\mathrm{Ø}}_{12}$也直接证明了其亚铁磁性。实验与散射截面的原子模拟非常吻合。