High-TC ferromagnetic order in CaRuO3/La 2/3Ca1/3MnO3 superlattices

P. F. Chen; B. B. Chen; X. L. Tan; H. R. Xu; X. F. Xuan; Z. Guo; F. Jin; W. B. Wu

doi:10.1063/1.4857715

High-T_C ferromagnetic order in CaRuO₃/La _2/3Ca_1/3MnO₃ superlattices

P. F. Chen, B. B. Chen, X. L. Tan, H. R. Xu, X. F. Xuan, Z. Guo, F. Jin, W. B. Wu

University of Science and Technology of China

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Ferromagnetic-metallic ground state with high Curie temperature (T _C) of 200-258 K has been observed in CaRuO₃/La _2/3Ca_1/3MnO₃ (CRO/LCMO) superlattices with the ultrathin LCMO layer of 0.8-3.2 nm thick. This contradicts the antiferromagnetic or low-T_C insulating ground state observed in single-layer LCMO thin-films. T_C and the saturated magnetization of the superlattices are determined dominantly by the LCMO layer thicknesses, indicating no direct magnetic contribution from the CRO layers or the interfaces. Also, they are less sensitive to the growth oxygen pressure as compared to the pure LCMO films. We ascribe the stabilized, bulklike ferromagnetism in the ultrathin LCMO layer to charge transfer from CRO at the interfaces, which could enhance the double-exchange and meanwhile suppress the phase separation, contrary to the case for LCMO thin-films. This interface engineering that can greatly depress the notorious "dead layer" in manganites might be significant in designing the correlated spintronic devices.

Original language	English
Article number	262402
Journal	Applied Physics Letters
Volume	103
Issue number	26
DOIs	https://doi.org/10.1063/1.4857715
State	Published - 23 Dec 2013
Externally published	Yes

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title = "High-TC ferromagnetic order in CaRuO3/La 2/3Ca1/3MnO3 superlattices",

abstract = "Ferromagnetic-metallic ground state with high Curie temperature (T C) of 200-258 K has been observed in CaRuO3/La 2/3Ca1/3MnO3 (CRO/LCMO) superlattices with the ultrathin LCMO layer of 0.8-3.2 nm thick. This contradicts the antiferromagnetic or low-TC insulating ground state observed in single-layer LCMO thin-films. TC and the saturated magnetization of the superlattices are determined dominantly by the LCMO layer thicknesses, indicating no direct magnetic contribution from the CRO layers or the interfaces. Also, they are less sensitive to the growth oxygen pressure as compared to the pure LCMO films. We ascribe the stabilized, bulklike ferromagnetism in the ultrathin LCMO layer to charge transfer from CRO at the interfaces, which could enhance the double-exchange and meanwhile suppress the phase separation, contrary to the case for LCMO thin-films. This interface engineering that can greatly depress the notorious {"}dead layer{"} in manganites might be significant in designing the correlated spintronic devices.",

author = "Chen, \{P. F.\} and Chen, \{B. B.\} and Tan, \{X. L.\} and Xu, \{H. R.\} and Xuan, \{X. F.\} and Z. Guo and F. Jin and Wu, \{W. B.\}",

year = "2013",

month = dec,

day = "23",

doi = "10.1063/1.4857715",

language = "英语",

volume = "103",

journal = "Applied Physics Letters",

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T1 - High-TC ferromagnetic order in CaRuO3/La 2/3Ca1/3MnO3 superlattices

AU - Chen, P. F.

AU - Chen, B. B.

AU - Tan, X. L.

AU - Xu, H. R.

AU - Xuan, X. F.

AU - Guo, Z.

AU - Jin, F.

AU - Wu, W. B.

PY - 2013/12/23

Y1 - 2013/12/23

N2 - Ferromagnetic-metallic ground state with high Curie temperature (T C) of 200-258 K has been observed in CaRuO3/La 2/3Ca1/3MnO3 (CRO/LCMO) superlattices with the ultrathin LCMO layer of 0.8-3.2 nm thick. This contradicts the antiferromagnetic or low-TC insulating ground state observed in single-layer LCMO thin-films. TC and the saturated magnetization of the superlattices are determined dominantly by the LCMO layer thicknesses, indicating no direct magnetic contribution from the CRO layers or the interfaces. Also, they are less sensitive to the growth oxygen pressure as compared to the pure LCMO films. We ascribe the stabilized, bulklike ferromagnetism in the ultrathin LCMO layer to charge transfer from CRO at the interfaces, which could enhance the double-exchange and meanwhile suppress the phase separation, contrary to the case for LCMO thin-films. This interface engineering that can greatly depress the notorious "dead layer" in manganites might be significant in designing the correlated spintronic devices.

AB - Ferromagnetic-metallic ground state with high Curie temperature (T C) of 200-258 K has been observed in CaRuO3/La 2/3Ca1/3MnO3 (CRO/LCMO) superlattices with the ultrathin LCMO layer of 0.8-3.2 nm thick. This contradicts the antiferromagnetic or low-TC insulating ground state observed in single-layer LCMO thin-films. TC and the saturated magnetization of the superlattices are determined dominantly by the LCMO layer thicknesses, indicating no direct magnetic contribution from the CRO layers or the interfaces. Also, they are less sensitive to the growth oxygen pressure as compared to the pure LCMO films. We ascribe the stabilized, bulklike ferromagnetism in the ultrathin LCMO layer to charge transfer from CRO at the interfaces, which could enhance the double-exchange and meanwhile suppress the phase separation, contrary to the case for LCMO thin-films. This interface engineering that can greatly depress the notorious "dead layer" in manganites might be significant in designing the correlated spintronic devices.

UR - https://www.scopus.com/pages/publications/84891616459

U2 - 10.1063/1.4857715

DO - 10.1063/1.4857715

M3 - 文章

AN - SCOPUS:84891616459

SN - 0003-6951

VL - 103

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

M1 - 262402

ER -

High-T_C ferromagnetic order in CaRuO₃/La _2/3Ca_1/3MnO₃ superlattices

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