Interface effects and the evolution of ferromagnetism in La2/3Sr1/3MnO3 ultrathin films

被引：9

作者：

Veis, M. ^{[1
]}

Zahradnik, M. ^{[1
]}

Antos, R. ^{[1
]}

Visnovsky, S. ^{[1
]}

Lecoeur, Ph ^{[2
]}

Esteve, D. ^{[2
]}

Autier-Laurent, S. ^{[2
]}

Renard, J-P ^{[2
]}

Beauvillain, P. ^{[2
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague 2, Czech Republic

[2] Univ Paris 11, Inst Elect Fondamentale, IEF UMR 862, F-91405 Orsay, France

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2014年 / 15卷 / 01期

关键词：

magneto-optics; manganites; magneto-optical Kerr effect; ultrathin films; interface effects; SPIN POLARIZATION; THIN; MAGNETORESISTANCE;

D O I：

10.1088/1468-6996/15/1/015001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pulse laser deposited La2/3Sr1/3MnO3 ultrathin films on SrTiO3 substrates were characterized by polar and longitudinal Kerr magneto-optical spectroscopy. Experimental data were confronted with theoretical simulations based on the transfer matrix formalism. An excellent agreement was achieved for a 10.7 nm thick film, while a distinction in the Kerr effect amplitudes was obtained for a 5 nm thick film. This demonstrated the suppression of ferromagnetism due to the layer/substrate interface effects. A revised, depth-sensitive theoretical model with monolayer resolution described the experimental data well, and provided clear cross-section information about the evolution of ferromagnetism inside the film. It was found that the full restoration of the double-exchange mechanism, responsible for the ferromagnetic ordering in La2/3Sr1/3MnO3, occurs within the first nine monolayers of the film. Moreover, all the studied films exhibited magneto-optical properties similar to bulk crystals and thick films. This confirmed a fully developed perovskite structure down to 5 nm.

引用

页数：6

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