Ferromagnetism in tetragonally distorted LaCoO3 thin films

被引：47

作者：

Mehta, Virat Vasav ^{[1
,2
]}

Liberati, Marco ^{[1
,2
]}

Wong, Franklin J. ^{[1
,2
]}

Chopdekar, Rajesh Vilas ^{[1
,2
]}

Arenholz, Elke ^{[3
]}

Suzuki, Yuri ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 07期

关键词：

SPIN-STATE; TRANSITION;

D O I：

10.1063/1.3059606

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thin films of epitaxial LaCoO3 were synthesized on SrTiO3 and (La, Sr) (Al, Ta)O-3 substrates, varying the oxygen background pressure in order to evaluate the impact of epitaxial growth as well as oxygen vacancies on the long range magnetic order. The epitaxial constraints from the substrate impose a tetragonal distortion compared to the bulk form. X-ray absorption and x-ray magnetic circular dichroism measurements confirmed that the ferromagnetism arises from the Co ions and persists through the entire thickness of the film. It was found that for the thin films to show ferromagnetic order they have to be grown under the higher oxygen pressures. A correlation of the structure and magnetism suggests that the tetragonal distortions induce the ferromagnetism. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3059606]

引用

页数：3

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