Dy3Fe5O12石榴石中磁电混合激发的光学鉴别
Optical identification of hybrid magnetic and electric excitations in Dy3Fe5O12 garnet
摘要：
研究了磁介电材料Dy_3Fe_5 O_（12）石榴石在13 ~ 100cm ~（-1）和5 ~ 80 K低温下的远红外光谱。透射率、反射率和旋转分析器椭圆偏振法的组合被用于明确地识别红外模式的偶极活动的类型。除了纯粹的介电和磁模式，我们观察到几个混合模式与混合的磁和电偶极子活动。这些模式起源于Fe和Dy离子的磁矩之间的超交换。使用Mu=/=1的材料的4 × 4矩阵形式主义，我们模拟了实验光谱，并确定了远红外介电和磁导率函数。振子强度Se（m）的匹配条件Mu（Wh）*Se=Eps（Wh）*Sm解释了在反射率中Wh处观察到的某些混合模式的消失。
英文摘要：
Far-infrared spectra of magneto-dielectric Dy3Fe5O12 garnet were studied between 13 and 100 cm-1 and at low temperatures between 5 and 80 K. A combination of transmission, reflectivity, and rotating analyzer ellipsometry was used to unambiguously identify the type of the dipole activity of the infrared modes. In addition to purely dielectric and magnetic modes, we observed several hybrid modes with a mixed magnetic and electric dipole activity. These modes originate from the superexchange between magnetic moments of Fe and Dy ions. Using 4x4 matrix formalism for materials with Mu=/=1, we modeled the experimental optical spectra and determined the far-infrared dielectric and magnetic permeability functions. The matching condition Mu(Wh)*Se=Eps(Wh)*Sm for the oscillator strengths Se(m) explains the observed vanishing of certain hybrid modes at Wh in reflectivity.
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