Origin of Interface Magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 Heterostructures

被引：161

作者：

Salluzzo, M. ^{[1
]}

Gariglio, S. ^{[2
]}

Stornaiuolo, D. ^{[2
]}

Sessi, V. ^{[3
]}

Rusponi, S. ^{[4
]}

Piamonteze, C. ^{[5
]}

De Luca, G. M. ^{[1
]}

Minola, M. ^{[6
,7
]}

Marre, D. ^{[8
,9
]}

Gadaleta, A. ^{[8
,9
]}

Brune, H. ^{[4
]}

Nolting, F. ^{[5
]}

Brookes, N. B. ^{[3
]}

Ghiringhelli, G. ^{[6
,7
]}

机构：

[1] CNR SPIN, I-80126 Naples, Italy

[2] Univ Geneva, Dept Phys Mat Condensee, CH-1211 Geneva 4, Switzerland

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[4] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] CNR SPIN, I-20133 Milan, Italy

[7] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy

[8] CNR SPIN, I-14146 Genoa, Italy

[9] Univ Genoa, Dipartimento Fis, I-14146 Genoa, Italy

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 08期

关键词：

FERROMAGNETISM; SUPERCONDUCTIVITY; COEXISTENCE; DICHROISM;

D O I：

10.1103/PhysRevLett.111.087204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Possible ferromagnetism induced in otherwise nonmagnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetism can be stabilized by a negative exchange interaction between the electrons transferred to the interface and local magnetic moments. These local magnetic moments are associated with magnetic Ti3+ ions at the interface itself for LaAlO3/SrTiO3 and to Mn3+ ions in the overlayer for BiMnO3/SrTiO3. In LaAlO3/SrTiO3 the induced magnetism is quenched by annealing in oxygen, suggesting a decisive role of oxygen vacancies in this phenomenon.

引用

页数：5

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