Skin Layer of BiFeO3 Single Crystals

被引：79

作者：

Marti, Xavi ^{[1
]}

Ferrer, Pilar ^{[2
,3
]}

Herrero-Albillos, Julia ^{[4
]}

Narvaez, Jackeline ^{[5
]}

Holy, Vaclav ^{[1
]}

Barrett, Nick ^{[6
]}

Alexe, Marin ^{[7
]}

Catalan, Gustau ^{[5
,8
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[2] ESRF, SpLine BM25, Grenoble, France

[3] Inst Ciencia Mat Madrid ICMM CSIC, Madrid, Spain

[4] Helmholtz Zentrum Berlin Mat & Energie GmbH, D-12489 Berlin, Germany

[5] CSIC ICN, Ctr Invest Nanociencia & Nanotecnol CIN2, Barcelona 08193, Spain

[6] LENSIS, CEA, IRAMIS, SPCSI, F-91191 Gif Sur Yvette, France

[7] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany

[8] Inst Catala Recerca & Estudis Avancats ICREA, Catalunya, Spain

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 23期

关键词：

EXCHANGE BIAS; AB-INITIO; POLARIZATION; SURFACES; RELAXOR; GROWTH; SRTIO3; PHASE;

D O I：

10.1103/PhysRevLett.106.236101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A surface layer ("skin") different from the bulk was found in single crystals of BiFeO3. Impedance analysis and grazing incidence x-ray diffraction reveal a phase transition at T* similar to 275 +/- 5 degrees C that is confined within the surface of BiFeO3. X-ray photoelectron spectroscopy and refraction-corrected x-ray diffraction as a function of incidence angle and photon wavelength indicate a reduced electron density and an elongated out-of-plane lattice parameter within a few nanometers of the surface. The skin will affect samples with large surface to volume ratios, as well as devices that rely on interfacial coupling such as exchange bias.

引用

页数：4

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