Finite size effect in epitaxial La0.7A0.3CoO3 (A= Ca, Sr, Ba) thin films

被引：8

作者：

Fuchs, D ^{[1
]}

Morán, O ^{[1
]}

Adelmann, P ^{[1
]}

Schneider, R ^{[1
]}

机构：

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

来源：

PHYSICA B-CONDENSED MATTER | 2004年 / 349卷 / 1-4期

关键词：

cobaltites; thin films; size effect;

D O I：

10.1016/j.physb.2004.04.046

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The in-plane and out-of-plane magnetization of La(0.7)A(0.3)CoO(3) thin films with A = Ca, Sr, or Ba were investigated as a function of the film thickness ranging from about 10 to 1000 monolayers. Nearly lattice matched epitaxial (0 0 1) oriented films have been grown by pulsed laser deposition on (LaAlO3)(0.3)(Sr2AlTaO6)(0.7) substrates. Their magnetic properties were characterized by SQUID measurements. Field cooled measurements were carried out with the field parallel or perpendicular to the film surface. All the films showed a finite size scaling law without any sign of a spin reorientation down to at least 10 monolayers. For the critical exponent we obtained lambdaapproximate to 0.9+/-0.2. For the model parameter No, discussed as the spin-spin coupling length we obtained 2-3 monolayers which compares well with the value measured for Co films. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：337 / 341

页数：5

共 15 条

[1] Structural details and magnetic order of La1-xSrxCoO3 (x≤0.3) [J].

Caciuffo, R ;

Rinaldi, D ;

Barucca, G ;

Mira, J ;

Rivas, J ;

Señarís-Rodríguez, MA ;

Radaelli, PG ;

Fiorani, D ;

Goodenough, JB .

PHYSICAL REVIEW B, 1999, 59 (02) :1068-1078

[2] CRITICAL-BEHAVIOR OF THE 3-DIMENSIONAL ISING-MODEL - A HIGH-RESOLUTION MONTE-CARLO STUDY [J].

FERRENBERG, AM ;

LANDAU, DP .

PHYSICAL REVIEW B, 1991, 44 (10) :5081-5091

[3] SCALING THEORY FOR FINITE-SIZE EFFECTS IN CRITICAL REGION [J].

FISHER, ME ;

BARBER, MN .

PHYSICAL REVIEW LETTERS, 1972, 28 (23) :1516-&

[4] Dielectric tunability of coherently strained LaAlO3/SrTiO3 superlattices [J].

Fuchs, D ;

Adam, M ;

Schweiss, P ;

Schneider, R .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (08) :5288-5295

[5] The structural, magnetic and electrical properties of the hole-doped cobaltites La0.7(Ca1-xBax)0.3CoO3 (x=0.0, 0.5 and 1.0) [J].

Ganguly, R ;

Hervieu, M ;

Nguyen, N ;

Maignan, A ;

Martin, C ;

Raveau, B .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2001, 13 (48) :10911-10924

[6] Influence of the size of dopant ion on ferromagnetic behavior of Ln0.7A0.3CoO3 system [Ln = La, Nd; and A = Ca, (Ca, Sr), Sr, (Sr, Ba), Ba] [J].

Ganguly, R ;

Gopalakrishnan, IK ;

Yakhmi, JV .

PHYSICA B, 1999, 271 (1-4) :116-124

[7] MAGNETISM IN THE FEW-MONOLAYERS LIMIT - A SURFACE MAGNETOOPTIC KERR-EFFECT STUDY OF THE MAGNETIC-BEHAVIOR OF ULTRATHIN FILMS OF CO, NI, AND CO-NI ALLOYS ON CU(100) AND CU(111) [J].

HUANG, F ;

KIEF, MT ;

MANKEY, GJ ;

WILLIS, RF .

PHYSICAL REVIEW B, 1994, 49 (06) :3962-3971

[8] Huge anisotropic magnetostriction in La1-xSrxCoO3-δ (x≥0.3):: Field-induced orbital instability [J].

Ibarra, MR ;

Mahendiran, R ;

Marquina, C ;

Garcia-Landa, B ;

Blasco, J .

PHYSICAL REVIEW B, 1998, 57 (06) :R3217-R3220

[9] MAGNETIC COMPOUNDS WITH PEROVSKITE STRUCTURE .3. FERROMAGNETIC COMPOUNDS OF COBALT [J].

JONKER, GH ;

VANSANTEN, JH .

PHYSICA, 1953, 19 (01) :120-130

[10]

LIDE M, 1996, PHYS REV B, V54

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