Artificially ordered Fe-Cu alloy superlattices on Cu(001). I. Studies on the structural and magnetic properties
Artificially ordered Fe-Cu alloy superlattices on Cu(001). I. Studies on the structural and magnetic properties
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Cu(001) 上人工有序的 Fe-Cu 合金超晶格。
DOI：
10.1103/physrevb.58.8549
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发表时间：
1998
影响因子：
3.7
通讯作者：
J. Kirschner
中科院分区：
文献类型：
--
作者：
S. Manoharan;M. Klaua;Jun Shen;J. Barthel;H. Jenniches;J. Kirschner
采用脉冲激光沉积法在Cu（001）衬底上交替堆积Fe和Cu单层膜[Fe（1 ML）/Cu（1 ML）] n（n<25），制备了L10相的亚稳fcc结构Fe-Cu合金.所观察到的反射高能电子衍射振荡为每个Fe和Cu层和它们的生长模式，通过扫描隧道显微镜研究表明，近逐层生长。n= 22（22个双层膜）的合金具有fcc（001）结构，然后由fcc结构转变为bcc结构。利用磁光克尔效应测量的磁滞回线表明，当1<~ n<~ 25时，薄膜是铁磁性的，易磁化轴在薄膜平面内。对于双层结构的基本单元的居里温度为130 K的估计。它线性增加的堆叠的数量达到400 K的饱和值，在五个双层及以上。
Metastable fcc Fe-Cu alloys in the L 1 0 phase have been prepared by stacking one monolayer of Fe and one monolayer of Cu alternately,[F e (1 M L)/C u (1 M L)] n (where n<~ 2 5) onto a Cu (001) substrate using pulsed-laser deposition. The observed reflection high-energy electron-diffraction oscillations for each Fe and Cu layer and their growth mode as studied by scanning tunneling microscopy indicate a nearly layer-by-layer growth. Alloys up to n= 22 (22 bilayers) have fcc (001) structure, then change from fcc to bcc structure. Magnetic hysteresis loops measured using the magneto-optical Kerr effect indicate that for 1<~ n<~ 25 the films are ferromagnetic with the easy axis of magnetization within the plane of the films. For the basic unit of double-layer configuration a Curie temperature of 130 K is estimated. It increases linearly with the number of stackings reaching a saturation value of 400 K at five double layers and beyond.