Image charge screening: A new approach to enhance magnetic ordering temperatures in ultrathin correlated oxide films

被引：22

作者：

Altieri, S. ^{[1
]}

Finazzi, M. ^{[2
]}

Hsieh, H. H. ^{[3
]}

Haverkort, M. W. ^{[4
]}

Lin, H. -J. ^{[5
]}

Chen, C. T. ^{[5
]}

Frabboni, S. ^{[1
,6
]}

Gazzadi, G. C. ^{[1
]}

Rota, A. ^{[6
]}

Valeri, S. ^{[1
,6
]}

Tjeng, L. H. ^{[4
]}

机构：

[1] Natl Ctr NanoStruct & BioSyst Surfaces S3, CNR, INFM, I-41100 Modena, Italy

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

[3] Natl Def Univ, Chung Cheng Inst Technol, Tao Yuan 335, Taiwan

[4] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30077, Taiwan

[6] Univ Modena & Reggio Emilia, Dept Phys, I-41100 Modena, Italy

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 17期

关键词：

magnetic thin films; Neel temperature; nickel compounds; superexchange interactions; TRANSITION-METAL COMPOUNDS; SUPEREXCHANGE INTERACTIONS; ANTIFERROMAGNETIC NIO; ELECTRONIC-STRUCTURE; PRESSURE-DEPENDENCE; CURIE-TEMPERATURE; AB-INITIO; DICHROISM; MOMENTS; SURFACE;

D O I：

10.1103/PhysRevB.79.174431

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have tested the concept of image charge screening as a new approach to restore magnetic ordering temperatures and superexchange interactions in correlated oxide ultrathin films. Using a three-monolayer NiO(100) film grown on Ag(100) and an identically thin film on MgO(100) as model systems, we observed that the Neel temperature of the NiO film on the highly polarizable metal substrate is 390 K while that of the film on the poorly polarizable insulator substrate is below 40 K. This demonstrates that screening by highly polarizable media may point to a practical way toward designing strongly correlated oxide nanostructures with greatly improved magnetic properties.

引用

页数：6

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