Evidence for strontium segregation in La0.7Sr0.3MnO3 thin films grown by pulsed laser deposition:: consequences for tunnelling junctions

被引：82

作者：

Bertacco, R

Contour, JP

Barthélemy, A

Olivier, J

机构：

[1] Politecn Milan, Dipartimento Fis, INFM, I-20133 Milan, Italy

[2] CNRS Thales, Unite Mixte Phys, F-91404 Orsay, France

[3] TRT, F-91404 Orsay, France

来源：

SURFACE SCIENCE | 2002年 / 511卷 / 1-3期

关键词：

surface segregation; magnetic interfaces; heterojunctions; X-ray photoelectron spectroscopy; photoelectron diffraction;

D O I：

10.1016/S0039-6028(02)01546-7

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：

This work addresses the issue of the quality of La0.7Sr0.3MnO3 (LSMO) surfaces integrated in tunnelling junctions. From a detailed X-ray photoemission spectroscopy analysis it results that Sr segregates at the surface of LSMO films grown by pulsed laser deposition at high O-2 pressure (350 mTorr). This fact is attributed to the presence of an outermost SrO layer, which is critical for the subsequent formation of a good LSMO/insulator interface. In particular we found that the unique properties of the junctions employing SrTiO3 as insulator, are strictly correlated to the integration of the SrO segregated layer in the SrTiO3 structure. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：366 / 372

页数：7

共 20 条

[1] ANGLE-RESOLVED X-RAY PHOTOELECTRON-SPECTROSCOPY FOR THE CHARACTERIZATION OF GAAS(001) SURFACES [J].