SURFACE ALLOYING AND PINHOLE FORMATION IN ULTRA-THIN FE/CU(100) FILMS

被引：71

作者：

SHEN, J ^{[1
]}

GIERGIEL, J ^{[1
]}

SCHMID, AK ^{[1
]}

KIRSCHNER, J ^{[1
]}

机构：

[1] FRITZ HABER INST,OF,D-14195 BERLIN,GERMANY

来源：

SURFACE SCIENCE | 1995年 / 328卷 / 1-2期

关键词：

IRON; SCANNING TUNNELING MICROSCOPY; SURFACE DIFFUSION;

D O I：

10.1016/0039-6028(95)00024-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Relatively mild annealing sometimes produces unexpectedly large changes in surface composition of ultra-thin films. We report results of a scanning tunnelling microscopy study of such annealing in an Fe/Cu(100) system. Copper appears in the surface region after a short 490 K anneal. We specifically exclude the possibility of bulk interdiffusion and conclude that this surface copper comes from the substrate through microscopic pinholes. Our primary finding is that the balance of surface free energies which strongly prefers Cu/Fe/Cu over Fe/Cu is the main driving force for pinhole formation and copper segregation. Furthermore, we report a significant surface alloying in this otherwise almost immiscible system.

引用

页码：32 / 46

页数：15

共 38 条

[1] MAGNETIZATION DIRECTION SWITCHING IN FE/CU(100) EPITAXIAL-FILMS - TEMPERATURE AND THICKNESS DEPENDENCE [J].