Abstract In this article, we report on the magnetic structure of DyFe11Ti and its thermal evolution as probed by neutron powder diffraction. A thermodiffraction technique was used to follow the temperature dependence of the magnetic moments, as well as their orientation. The Dy and Fe moments were coupled to each other in an antiparallel manner to form a ferrimagnet, where the easy magnetization direction at 2 K was the [110] axis in the basal (a, b) plane. This magnetic structure underwent two successive spin reorientation phenomena with increasing temperature. A large Dy magnetic moment of 9.7 Bohr magneton (μB) was obtained at low temperatures, and the magnitude decreased rapidly to 7.5μB at 200 K. The largest Fe magnetic moment was observed on the Fe 8i position. A ThMn12-type crystal structure was preserved in the studied temperature range, despite the large changes of the magnetic structure. A sharp tilt was observed at the first-order spin reorientation, TSR1; the angle between the easy magnetization axis and the crystal c axis was reduced from 90° at 2 K to about 20° at 200 K (where c is the easy axis above 200 K); and the Dy and Fe magnetic moments maintained an antiparallel coupling.

中文翻译：

---

DyFe11Ti磁性结构及其自旋重定向的中子衍射研究

摘要 在本文中，我们报道了 DyFe11Ti 的磁结构及其通过中子粉末衍射探测的热演化。使用热衍射技术来跟踪磁矩的温度依赖性，以及它们的取向。Dy 和 Fe 矩以反平行的方式相互耦合形成亚铁磁体，其中 2 K 时的易磁化方向是基面 (a, b) 中的 [110] 轴。随着温度的升高，这种磁性结构经历了两次连续的自旋重定向现象。在低温下获得了 9.7 玻尔磁子 (μB) 的大 Dy 磁矩，并且在 200 K 时大小迅速下降到 7.5μB。在 Fe 8i 位置观察到最大的 Fe 磁矩。在研究的温度范围内保留了 ThMn12 型晶体结构，尽管磁结构发生了很大变化。在一阶自旋重新定向 TSR1 处观察到急剧倾斜；易磁化轴与晶体c轴的夹角从2K时的90°减小到200K时的约20°（其中c为200K以上的易磁化轴）；Dy 和 Fe 磁矩保持反平行耦合。