论文标题
在高压下L10订购的Fept的晶格常数和磁性
Lattice constants and magnetism of L10-ordered FePt under high pressure
论文作者
论文摘要
我们通过第一原理计算和同步X射线测量值研究了高压下L10排序FEPT的晶格常数和磁性之间的关系。根据我们的计算，我们发现C/A比在约20 GPA时显示出异常，并且PT磁矩在〜60 GPA时被急剧抑制。至于C/A，我们通过粉末X射线衍射在〜20 GPA处实验验证了异常。我们还测量了X射线磁性圆形二色性在PT L边缘高达〜20 GPA。与计算一致，未观察到PT磁矩的任何显着变化。因此，这些结果表明，可以在高压下通过晶格变形在L10订购的Fept中产生新的磁状态的可能性。
We studied the relationship between the lattice constant and magnetism of L10-ordered FePt under high pressure by means of first-principles calculations and synchrotron x-ray measurements. Based on our calculations, we found that the c/a ratio shows an anomaly at ~ 20 GPa and that the Pt magnetic moment is sharply suppressed at ~ 60 GPa. As for the c/a, we experimentally verified the anomaly at ~ 20 GPa by powder x-ray diffraction. We also measured the x-ray magnetic circular dichroism at the Pt L edge up to ~ 20 GPa. Any significant change of the Pt magnetic moment was not observed, in agreement with the calculations. These results thus indicate the possibility that novel magnetic states can be created in L10-ordered FePt by lattice deformation under high pressure.
