Ferromagnetic order in epitaxially strained LaCoO3 thin films

被引：199

作者：

Fuchs, D. ^{[1
]}

Pinta, C.

Schwarz, T.

Schweiss, P.

Nagel, P.

Schuppler, S.

Schneider, R.

Merz, M.

Roth, G.

von Loehneysen, H.

机构：

[1] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[2] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

[3] Rhein Westfal TH Aachen, Inst Kristallog, D-52066 Aachen, Germany

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.75.144402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

LaCoO3 films grown epitaxially on < 001 > oriented (LaAlO3)(0.3)(Sr2AlTaO6)(0.7) substrates by pulsed laser deposition exhibit ferromagnetic ordering below a critical temperature, T-c, of 85 K. Polycrystalline films of LaCoO3 prepared in the same way did not show ferromagnetic order down to T approximate to 5 K, and their temperature dependent susceptibility was identical to that of bulk LaCoO3. The ferromagnetism in epitaxial films is not simply a property of the surface region, rather it extends over the complete film thickness, as shown by the linear increase of the saturated magnetic moment with increasing film thickness. We discuss this surprising result in terms of epitaxial tensile strain via the properly chosen substrate inducing ferromagnetic order.

引用

页数：5

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