Nanotwin-Induced Ferrimagnetism in an Antiferromagnetic Cr2O3 Thin Film on the SrTiO3 Substrate

IF 15.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ACS Nano Pub Date : 2025-01-07 DOI:10.1021/acsnano.4c12839
Xiang Li, Yixiao Jiang, Min Tian, Ting Xiong, Tingting Yao, Xuexi Yan, Ang Tao, Zhiqing Yang, Hengqiang Ye, Xiu-Liang Ma, Chunlin Chen
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Abstract

Nanotwinned materials have recently attracted intense interest since they often exhibit excellent mechanical properties that are far superior to those of the corresponding single crystals. However, how nanotwinned structures affect the physical properties of functional materials remains almost unexplored. In this study, we demonstrate ferrimagnetism in a nanotwinned antiferromagnetic Cr2O3 thin film. The Cr2O3 thin film grown on the SrTiO3 substrate comprises high-density nanotwins and exhibits an obvious room-temperature ferrimagnetic property, though the bulk Cr2O3 is intrinsically antiferromagnetic. Aberration-corrected transmission electron microscopy investigations reveal that the twin boundaries (TBs) of Cr2O3 are stoichiometric and have two types of atomic structures (i.e., denoted by type I and type II). First-principles calculations suggest that the type I TB exhibits an antiferromagnetic nature without a net magnetic moment, while the type II TB is ferrimagnetic and has a net magnetic moment of 3.0 μB/f.u. These findings suggest that nanotwins in functional materials can generate physical properties distinct from those of single crystals, thereby providing an efficient strategy for material design and performance control.

Abstract Image

SrTiO3衬底上反铁磁性Cr2O3薄膜的纳米孪晶诱导铁磁性
纳米孪晶材料由于其优异的机械性能远远优于相应的单晶,近年来引起了人们的极大兴趣。然而,纳米孪晶结构如何影响功能材料的物理性质仍然是未知的。在这项研究中,我们在纳米孪晶反铁磁性Cr2O3薄膜中证明了铁磁性。在SrTiO3衬底上生长的Cr2O3薄膜包含高密度纳米孪晶,并表现出明显的室温铁磁性,尽管大块Cr2O3本质上是反铁磁性的。通过透射电镜分析,发现Cr2O3的孪晶界具有化学计量性质,具有两种原子结构(即I型和II型)。第一性原理计算表明,I型TB具有反铁磁性,无净磁矩,而II型TB具有铁磁性,净磁矩为3.0 μB/f.u。这些发现表明,功能材料中的纳米孪晶可以产生与单晶不同的物理特性,从而为材料设计和性能控制提供了一种有效的策略。
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来源期刊
ACS Nano
ACS Nano 工程技术-材料科学:综合
CiteScore
26.00
自引率
4.10%
发文量
1627
审稿时长
1.7 months
期刊介绍: ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.
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