High-TC Interfacial Ferromagnetism in SrMnO3/LaMnO3 Superlattices

被引：33

作者：

Keunecke, Marius ^{[1
]}

Lyzwa, Fryderyk ^{[2
,3
]}

Schwarzbach, Danny ^{[4
]}

Roddatis, Vladimir ^{[4
]}

Gauquelin, Nicolas ^{[5
]}

Mueller-Caspary, Knut ^{[5
]}

Verbeeck, Johann ^{[5
]}

Callori, Sara J. ^{[6
,7
]}

Klose, Frank ^{[6
,8
]}

Jungbauer, Markus ^{[1
]}

Moshnyaga, Vasily ^{[1
]}

机构：

[1] Georg August Univ Gottingen, Erstes Phys Inst, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[2] Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland

[3] Univ Fribourg, Fribourg Ctr Nanomat, Chemin Musee 3, CH-1700 Fribourg, Switzerland

[4] Georg August Univ Gottingen, Inst Materialphys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[5] Univ Antwerp, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[6] ANSTO, Australian Ctr Neutron Scattering, New Illawarra Rd, Lucas Heights, NSW 2234, Australia

[7] Calif State Univ San Bernardino, Dept Phys, San Bernardino, CA 92407 USA

[8] Guangdong Technion Israel Inst Technol, 241 Xue Rd, Shantou 515063, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2020年 / 30卷 / 18期

基金：

瑞士国家科学基金会;

关键词：

charge transfer; interfaces; interfacial ferromagnetism; oxide superlattices; OXIDE; ELLIPSOMETRY; OSCILLATIONS; MODULATION; INSULATOR; GROWTH; LAMNO3;

D O I：

10.1002/adfm.201808270

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO3/SrMnO3 superlattices are presented showcasing a new high-temperature ferromagnetic phase with Curie temperature, T-C approximate to 360 K, caused by electron transfer from the surface of the LaMnO3 donor layer into the neighboring SrMnO3 acceptor layer. As a result, the SrMnO3 (top)/LaMnO3 (bottom) interface shows an enhancement of the magnetization as depth-profiled by polarized neutron reflectometry. The length scale of charge transfer, lambda(TF) approximate to 2 unit cells, is obtained from in situ growth monitoring by optical ellipsometry, supported by optical simulations, and further confirmed by high resolution electron microscopy and spectroscopy. A model of the inhomogeneous distribution of electron density in LaMnO3/SrMnO3 layers along the growth direction is concluded to account for a complex interplay between ferromagnetic and antiferromagnetic layers in superlattices.

引用

页数：11

共 49 条

[1] Polarized-neutron reflectometry [J].