Interfacial Ferromagnetism and Exchange Bias in CaRuO3/CaMnO3 Superlattices

被引：91

作者：

He, C. ^{[1
]}

Grutter, A. J. ^{[1
,2
]}

Gu, M. ^{[3
]}

Browning, N. D. ^{[3
]}

Takamura, Y. ^{[3
]}

Kirby, B. J. ^{[4
]}

Borchers, J. A. ^{[4
]}

Kim, J. W. ^{[5
]}

Fitzsimmons, M. R. ^{[5
]}

Zhai, X. ^{[1
]}

Mehta, V. V. ^{[1
,2
]}

Wong, F. J. ^{[1
]}

Suzuki, Y. ^{[1
,2
,6
,7
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[4] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[6] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[7] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 19期

基金：

美国国家科学基金会;

关键词：

PEROVSKITES; ANISOTROPY;

D O I：

10.1103/PhysRevLett.109.197202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have found ferromagnetism in epitaxially grown superlattices of CaRuO3/CaMnO3 that arises in one unit cell at the interface. Scanning transmission electron microscopy and electron energy loss spectroscopy indicate that the difference in magnitude of the Mn valence states between the center of the CaMnO3 layer and the interface region is consistent with double exchange interaction among the Mn ions at the interface. Polarized neutron reflectivity and the CaMnO3 thickness dependence of the exchange bias field together indicate that the interfacial ferromagnetism is only limited to one unit cell of CaMnO3 at each interface. The interfacial moment alternates between the 1 mu(B)/interface Mn ion for even CaMnO3 layers and the 0.5 mu(B)/interface Mn ion for odd CaMnO3 layers. This modulation, combined with the exchange bias, suggests the presence of a modulating interlayer coupling between neighboring ferromagnetic interfaces via the antiferromagnetic CaMnO3 layers.

引用

页数：5

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