Artificial fabrication and magnetic properties of non-equilibrium ordered alloys by monatomic layr control

我们比较了Ll_0型FeAu订购的合金制造的结构和磁性特性，这些特性是由单原子层控制的铁（xML） /Au （xML）超晶格，以及ML在何处代表单原子层厚度。X射线差异峰值对应于x+x= 2 x ML已被观察到x=整数和非整数的超晶格周期。X射线差异模式可以通过模型评估一个完整的分层-分层增长，通过样本来揭示结构一致性，并说明相干分层结构的形成。“永久性磁性异源能量被估计为从平面内和永久性磁性曲线中推断。”The product of the perpendicular anisotropy energy K_* and the Fe layr thickness t_<Fe>，K_*·t_<Fe>， for x=integers， decreases linearly with increasing t_<Fe>as seen in many magnetic superlattices。接口异构体能量K_s从线性关系增加的x小于1&lt; ... More 或者等于&gt; <less than or equal>x3，如果x4<greater than or equal>的饱和度是由扩展的Neel模型解释的。对于x=非整数，在其他方面，K_*·t_<Fe>vs. t<Fe>_偏离线性关系，并在1个ML周期内显示出振荡行为。我们认为这是一个与K_s减少到x=非整数界面粗糙度相关的后果。这一研究提供了对磁超晶格中的振荡性非同构的第一次发现。FMR的测量表明，平面上四个异构体也是t_的一个函数，如1个周期的t_<Fe>.在顺序中，将起源于振荡磁分析，更多的精确结构分析包括高分辨率TEM、EXAFS和原位STM都是必要的。磁性加速测量还可以指示Kerr旋转的振荡，用于低于光子能量的2.5 eV。用于<less than or equal>1x <less than or equal>8，在附加的情况下，3-4 eV周围可观察到，并提出铁层中三维电子元件的量子良好状态的形成。Less（低）

We have compared structural and magnetic properties of the Ll_0-type FeAu ordered alloy fabricated by monatomic layr control to those of Fe (x ML) /Au (x ML) superlattices, where ML represents monatomic layr thickness. X-ray diffraction peaks corresponding to the superlattice period of x+x=2x ML have been observed definitely both for x=integers and non-integers. The X-ray diffraction patterns can be simulated by the model assuming a complete layr-by-layr growth with strucutural coherence throughout the sample, indicating the formation of coherent layred structure. The perpendicular magnetic anisotropy energy has been estimated from the in-plane and perpendicular magnetization curves. The product of the perpendicular anisotropy energy K_* and the Fe layr thickness t_<Fe>, K_*・t_<Fe>, for x=integers, decreases linearly with increasing t_<Fe> as seen in many magnetic superlattices. The interface anisotorpy energy K_s evaluated from the linear relationship increases with x for 1<less than … More or equal>x<less than or equal>3, and saturates for x<greater than or equal>4, which is explained by an extended Neel model. For x=non-integers, on the other hand, K_*・t_<Fe> vs.t_<Fe> deviates from the linear relationship, and shows oscillatory behavior with a period of 1 ML.We consider that this is a consequence associated with the reduction in K_s due to the interface roughness for x=non-integers. This study provides the first discovery of the oscillatory perpendicular anisotropy in magnetic superlattices. Furthermore, FMR measurements have indicated that the in-plane fourfold anisotropy also oscillates as a function of t_<Fe> with a period of 1.ML.In order to elucidate the origin for the oscillatory magnetic anisotropies, more precise structure analyzes including high resolution TEM,EXAFS and in situ STM are necessary. Magnetooptical measurements also indicate the oscillation of the Kerr rotation for the photon energy less than 2.5 eV.For 1<less than or equal>x<less than or equal>8, in addition, prominent structure around 3-4 eV has been observed, suggesting the formation of quantum well states of 3d electrons in Fe layrs. Less