钴/铂型纳米合金的结构和秩序:从薄膜到支持簇

IF 8.2 1区 化学 Q1 CHEMISTRY, PHYSICAL
Pascal Andreazza , Véronique Pierron-Bohnes , Florent Tournus , Caroline Andreazza-Vignolle , Véronique Dupuis
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引用次数: 66

摘要

在纳米合金中,Co-Pt型(CoPt或FePt)支持的纳米结构是非常有趣的系统,因为原子排列和磁性行为之间存在直接联系。此外,由于原子排列的多样性,这些合金成为纳米合金领域的模型系统,无论是存在于体态还是特定于纳米尺度(化学有序的L10, L12,或无序的fcc结构,核壳结构,五重结构-二十面体或十面体等)。实验和建模工作之间的协同作用使得基于copt的支撑纳米颗粒在相图(温度、组成、尺寸效应)、动力学行为(生长、退火、排序)以及环境效应(衬底、盖层、基质、气体)和磁性方面的结构、形态和化学行为的概述得以出现。综述了这种复杂性的所有方面:合成策略(物理沉积,簇束沉积和湿化学方法),磁性行为(原子磁矩,磁各向异性能),结构转变(非晶/晶体结构,有序/无序,表面/界面偏析)等。在这一领域,由于研究对象的体积小,通常使用电子显微镜和x射线散射或吸收技术等研究技术。最后,从热力学和动力学的角度讨论了退火过程的几个方面(尺寸效应、临界温度、退火时间、孪晶、聚结等),退火过程是实现化学有序的关键现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structure and order in cobalt/platinum-type nanoalloys: from thin films to supported clusters

Among nanoalloys, Co–Pt type (CoPt or FePt) supported nanostructures are very interesting systems due to the direct link between atom arrangement and magnetic behavior. In addition, these alloys become model systems in the field of nanoalloys, due to the diversity of atom arrangements either present in the bulk state or specific to the nanoscale (chemically ordered L10, L12, or disordered fcc structures, core–shell, five-fold structures – icosahedral or decahedral, etc.). The synergy between experimental and modeling efforts has allowed the emergence of an overview of the structural, morphological and chemical behaviors of CoPt-based supported nanoparticles in terms of phase diagrams (temperature, composition, size effect), kinetic behavior (growth, annealing, ordering), and also in terms of environment effects (substrate, capping, matrix, gas) and of magnetic properties. All aspects of this complexity are reviewed: synthesis strategies (physical deposition, cluster beam deposition and wet chemical methods), magnetic behavior (atomic magnetic moment, magnetic anisotropy energy), structural transitions (non-crystalline/crystalline structures, order/disorder, surface/interface segregation), etc. In this field, the investigation techniques, such as electron microscopy and X-ray scattering or absorption techniques, are generally used at their ultimate limit due the small size of the studied objects. Finally, several aspects of the annealing process, which is a key phenomenon to achieve the chemical order, have been discussed in both thermodynamic and kinetic points of view (size effect, critical temperature, annealing time, twinning, coalescence, etc.).

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来源期刊
Surface Science Reports
Surface Science Reports 化学-物理:凝聚态物理
CiteScore
15.90
自引率
2.00%
发文量
9
审稿时长
178 days
期刊介绍: Surface Science Reports is a journal that specializes in invited review papers on experimental and theoretical studies in the physics, chemistry, and pioneering applications of surfaces, interfaces, and nanostructures. The topics covered in the journal aim to contribute to a better understanding of the fundamental phenomena that occur on surfaces and interfaces, as well as the application of this knowledge to the development of materials, processes, and devices. In this journal, the term "surfaces" encompasses all interfaces between solids, liquids, polymers, biomaterials, nanostructures, soft matter, gases, and vacuum. Additionally, the journal includes reviews of experimental techniques and methods used to characterize surfaces and surface processes, such as those based on the interactions of photons, electrons, and ions with surfaces.
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