Ferroelectricity‐Induced Surface Ferromagnetism in Core–Shell Magnetoelectric Nanoparticles

IF 2.5 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physica Status Solidi-Rapid Research Letters Pub Date : 2024-07-22 DOI:10.1002/pssr.202400122

Carlos A. I. Canhassi, Roman V. Chernozem, Polina V. Chernozem, Konstantin N. Romanyuk, Pavel Zelenovskiy, Alina O. Urakova, Evgeny Y. Gerasimov, Danila A. Koptsev, Maria A. Surmeneva, Roman A. Surmenev, Andrei L. Kholkin, Yakov Kopelevich

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Abstract

Magnetoelectric nanoparticles (NPs) present an important class of nanomaterials with a wide interest in piezocatalytic and biomedical applications. Herein, the results of magnetoelectric and magnetization measurements performed on core–shell NPs having magnetic core (MnFe2O4, MFO) and ferroelectric shell (Ba0.85Ca0.15Ti0.5Zr0.5O3, BCZT) synthesized by the microwave hydrothermal method are reported. Magnetic results are compared with the measurements on reference MFO NPs prepared under identical conditions. Detailed SQUID magnetometer measurements of the magnetization hysteresis loops M(H) down to 2 K reveal the existence of a clear exchange bias effect in pure MFO NPs attributed to the coexistence of ferromagnetic and antiferromagnetic short‐range interactions. When the magnetic core is covered by the thin ferroelectric BCZT shell, it is observed that 1) the shell suppresses the apparent bias effect and 2) induces an “extra” ferromagnetic magnetization at T < 20 K. The results indicate that this “extra” ferromagnetism has a 2D character and it is most likely related to the interface interactions between the MFO core and BCZT shell. Ferroelectric properties and strong magnetoelectric effect in core–shell NPs are revealed via piezoresponse force microscopy under magnetic field. The mechanisms of the observed effects are discussed.

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核壳磁电纳米粒子的铁电诱导表面铁磁性

磁电纳米粒子（NPs）是一类重要的纳米材料，在压电催化和生物医学领域有着广泛的应用。本文报告了通过微波水热法合成的具有磁核（MnFe2O4，MFO）和铁电壳（Ba0.85Ca0.15Ti0.5Zr0.5O3，BCZT）的核壳纳米粒子的磁电和磁化测量结果。磁性结果与在相同条件下制备的参考 MFO NPs 的测量结果进行了比较。对低至 2 K 的磁化磁滞回线 M(H) 进行的详细 SQUID 磁强计测量表明，纯 MFO NPs 中存在明显的交换偏置效应，这归因于铁磁和反铁磁短程相互作用的共存。结果表明，这种 "额外的 "铁磁性具有二维特性，很可能与 MFO 内核和 BCZT 外壳之间的界面相互作用有关。磁场下的压电响应力显微镜揭示了核壳 NPs 的铁电特性和强磁电效应。本文讨论了所观察到的效应的机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica Status Solidi-Rapid Research Letters 物理-材料科学：综合

CiteScore

5.20

自引率

3.60%

发文量

208

审稿时长

1.4 months

期刊介绍： Physica status solidi (RRL) - Rapid Research Letters was designed to offer extremely fast publication times and is currently one of the fastest double peer-reviewed publication media in solid state and materials physics. Average times are 11 days from submission to first editorial decision, and 12 days from acceptance to online publication. It communicates important findings with a high degree of novelty and need for express publication, as well as other results of immediate interest to the solid-state physics and materials science community. Published Letters require approval by at least two independent reviewers. The journal covers topics such as preparation, structure and simulation of advanced materials, theoretical and experimental investigations of the atomistic and electronic structure, optical, magnetic, superconducting, ferroelectric and other properties of solids, nanostructures and low-dimensional systems as well as device applications. Rapid Research Letters particularly invites papers from interdisciplinary and emerging new areas of research.