Dual Antiferromagnetic Coupling at La0.67Sr0.33MnO3/SrRuO3 Interfaces

被引：34

作者：

Solignac, A. ^{[1
]}

Guerrero, R. ^{[1
]}

Gogol, P. ^{[2
]}

Maroutian, T. ^{[2
]}

Ott, F. ^{[3
]}

Largeau, L. ^{[4
]}

Lecoeur, Ph. ^{[2
]}

Pannetier-Lecoeur, M. ^{[1
]}

机构：

[1] CEA Saclay, DSM IRAMIS SPEC URA 2464, F-91191 Gif Sur Yvette, France

[2] Univ Paris 11, CNRS UMR 8622, Inst Elect Fondamentale, F-91405 Orsay, France

[3] CEA Saclay, Lab Leon Brillouin CEA CNRS, F-91191 Gif Sur Yvette, France

[4] CNRS UPR 20, Lab Photon & Nanostruct, F-91460 Marcoussis, France

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 02期

关键词：

POSITIVE EXCHANGE BIAS; MAGNETIC TUNNEL-JUNCTIONS; MANGANITE THIN-FILMS; NEUTRON REFLECTOMETRY; SRRUO3; ANISOTROPY; BILAYERS; SURFACE; MAGNETORESISTANCE; POLARIZATION;

D O I：

10.1103/PhysRevLett.109.027201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the magnetic hysteresis cycle of La0.67Sr0.33MnO3/SrRuO3 antiferromagnetically coupled bilayers, by magnetometry and polarized neutron reflectometry. A positive exchange bias as well as an unusual asymmetry are observed on the magnetic reversal process of the La0.67Sr0.33MnO3 layer. Through an extended Stoner-Wohlfarth model comprising the magnetic anisotropy of both layers, we give experimental evidence that this asymmetry originates from two different but well-defined antiferromagnetic coupling strengths at the interface between the two magnetic oxides. The possible origin of this dual coupling is discussed in view of our experimental results.

引用

页数：5

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