Y-rich yttrium iron garnet (Y-YIG) thin films were grown on gadolinium gallium garnet substrates using pulsed laser deposition from a ${\mathrm{YFeO}}_3$ target. The films are epitaxial on the substrate, and the unit cell of (001)- and (111)-oriented Y-YIG undergoes a tetragonal or rhombohedral distortion, respectively. The Y-YIG has lower room temperature magnetization but higher low-temperature magnetization than bulk YIG, and its Curie temperature was in the range of 330–400 K, depending on the growth conditions. First-principles calculations predict that ${\mathrm{Y}}_{\mathrm{Fe}}$ antisite defects are more stable in octahedral than tetrahedral Fe sites. Temperature-dependent magnetization measurements together with a superexchange dilution model and composition determined from x-ray photoelectron spectroscopy indicate that nonmagnetic species (${\mathrm{Y}}^{3+}$ and vacancies) are predominantly accommodated in the octahedral sites, but there is a significant occupancy of tetrahedral sites.

中文翻译：

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外延富 Y 钇铁石榴石薄膜的磁性和位点占有率

使用脉冲激光沉积在钆镓石榴石衬底上生长富含 Y 的钇铁石榴石 (Y-YIG) 薄膜 ${\mathrm{氧化钇}}_3$目标。薄膜在基板上外延，(001) 和 (111) 取向的 Y-YIG 晶胞分别发生四方或菱形畸变。Y-YIG 的室温磁化强度较低，但低温磁化强度高于块状 YIG，其居里温度在 330-400 K 范围内，具体取决于生长条件。第一性原理计算预测${\mathrm{是}}_{铁}$八面体中的反位缺陷比四面体 Fe 位点更稳定。与温度相关的磁化测量值以及从 X 射线光电子能谱确定的超交换稀释模型和成分表明非磁性物质（${\mathrm{是}}^{3+}$ 和空缺）主要位于八面体位置，但四面体位置也有大量占用。