Effects of thickness on the cation segregation in epitaxial (001) and (110) La2/3Ca1/3MnO3 thin films

被引：42

作者：

Estrade, S. ^{[1
]}

Rebled, J. M. ^{[1
]}

Arbiol, J. ^{[1
]}

Peiro, F. ^{[1
]}

Infante, I. C. ^{[2
]}

Herranz, G. ^{[2
]}

Sanchez, F. ^{[2
]}

Fontcuberta, J. ^{[2
]}

Cordoba, R. ^{[3
]}

Mendis, B. G. ^{[4
]}

Bleloch, A. L. ^{[4
]}

机构：

[1] Univ Barcelona, Dept Elect, MIND IN2UB, E-08028 Barcelona, Catalonia, Spain

[2] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Catalonia, Spain

[3] Inst Univ Invest Nanociencia Aragon INA, Zaragoza 50009, Spain

[4] STFC Daresbury, SuperSTEM Lab, Daresbury WA4 4AD, England

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 07期

关键词：

calcium compounds; elasticity; electron energy loss spectra; ferromagnetic materials; interface magnetism; lanthanum compounds; magnetic epitaxial layers; mixed valence compounds; segregation; stoichiometry; strontium compounds; tensile strength; INTERFACES;

D O I：

10.1063/1.3211130

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron-energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 (LCMO) films of various thicknesses grown on SrTiO3 (001) and (110) substrates. For relatively thick films (>= 20 nm), epitaxial tensile strain in (001) films promotes a compositional La/Ca gradient across the film thickness, being the interface La rich, while the relaxed (110) films are chemically homogeneous. In contrast, much thinner (001) and (110) LCMO films display a different La/Ca distribution, being La rich at the free surface. The observed distinct thickness-dependent composition gradient behavior reflects a balance between strain-induced elastic energy minimization and kinetic effects during growth.

引用

页数：3

共 15 条

[1] Nanoscale multiphase separation at La2/3Ca1/3MnO3/SrTiO3 interfaces -: art. no. 067210 [J].