Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
Helmholtz Zentrum Berlin , Albert-Einstein-Str. 15, 12489 Berlin, Germany.
Struct Dyn. 2016 Sep 7;3(5):054302. doi: 10.1063/1.4961253. eCollection 2016 Sep.
We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated antiferromagnetic dysprosium thin film. The loss of antiferromagnetic order is evidenced by a pronounced lattice contraction. We devise a method to determine the energy flow between the phonon and spin system from calibrated Bragg peak positions in thermal equilibrium. Reestablishing the magnetic order is much slower than the cooling of the lattice, especially around the Néel temperature. Despite the pronounced magnetostriction, the transfer of energy from the spin system to the phonons in Dy is slow after the spin-order is lost.
我们展示了一个温度和剂量率依赖的激光加热反铁磁镝薄膜的超快 X 射线衍射研究。反铁磁序的损失表现为晶格的明显收缩。我们设计了一种方法，通过在热平衡时对布拉格峰位置进行标定来确定声子和自旋系统之间的能量传递。重建磁序比晶格冷却慢得多，特别是在奈尔温度附近。尽管磁致伸缩明显，但在自旋有序消失后，从自旋系统向镝中的声子传递能量仍然很慢。
