Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry

doi:10.1088/1674-1056/27/9/097701

Abstract

The magneto-electric effect in magnetic materials has been widely investigated, but obtaining an enhanced magneto-electric effect is challenging. In this study, tricolor superlattices composed of manganese oxides–Pr_0.9Ca_0.1MnO₃, La_0.9Sr_0.1MnO₃, and La_0.9Sb_0.1MnO₃–on (001)-oriented Nb:SrTiO₃ substrates with broken space-inversion and time-reversal symmetries are designed. Regarding the electric polarization in the hysteresis loops of the superlattices at different external magnetic fields, both coercive electric field E_c and remnant polarization intensity P_r clearly show strong magnetic-field dependences. At low temperatures (<120 K), a considerable magneto-electric effect in the well-defined tricolor superlattice is observed that is absent in the single compounds. Both maxima of the magneto-electric coupling coefficients ΔE_c and ΔP_r appear at 30 K. The magnetic dependence of the dielectric constant further supports the magneto-electric effect. Moreover, a dependence of the magneto-electric effect on the periodicity of the superlattices with various structures is observed, which indicates the importance of interfaces. Our experimental results verify previous theoretical results regarding magneto-electric interactions, thereby paving the way for the design and development of novel magneto-electric devices based on manganite ferromagnets.

Keywords: multiferroic magneto-electric effect superlattice

Received: 11 May 2018
Revised: 09 June 2018
Accepted manuscript online:

PACS:	77.55.Nv	(Multiferroic/magnetoelectric films)
	75.85.+t	(Magnetoelectric effects, multiferroics)
	77.55.Px	(Epitaxial and superlattice films)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 61471301).

Corresponding Authors: Changle Chen
E-mail: chenchl@nwpu.edu.cn

Cite this article:

Huanyu Pei(裴环宇), Shujin Guo(郭蜀晋), Hong Yan(闫虹), Changle Chen(陈长乐), Bingcheng Luo(罗炳成), Kexin Jin(金克新) Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry 2018 Chin. Phys. B 27 097701

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Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry

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