操控阵列中纳米粒子组装体的磁各向异性。

Manipulate the magnetic anisotropy of nanoparticle assemblies in arrays.

机构信息

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.

出版信息

J Colloid Interface Sci. 2017 Jul 1;497:14-22. doi: 10.1016/j.jcis.2017.02.056. Epub 2017 Feb 24.

DOI:10.1016/j.jcis.2017.02.056

PMID:28260671

Abstract

Tuning the magnetic anisotropy of nanoparticle assemblies is critical for their applications such as on-chip magnetic electronic components and electromagnetic wave absorption. In this work, we developed a facile hierarchical self-assembly method to separately control the magnetic shape and magnetocrystalline anistropy of individual nanoparticle assemblies in arrays. Since magnetic nanoparticle assemblies in the array have the same size, shape and alignment, we are able to study the magnetic properties of individual nanoparticle assembly by measuring the whole arrays. The interplay between the two magnetic anisotropies was systematically studied for disk- and bar-shaped nanoparticle assemblies. Maximum magnetic anisotropy was obtained when the easy axis of magnetic nanoparticles was aligned along the long axes of the bar-shaped nanoparticles assemblies.

摘要

调整纳米颗粒组装体的磁各向异性对于它们的应用至关重要，例如片上磁电子元件和电磁波吸收。在这项工作中，我们开发了一种简便的分级自组装方法，以分别控制阵列中单个纳米颗粒组装体的磁形状和磁晶各向异性。由于阵列中的磁性纳米颗粒组装体具有相同的尺寸、形状和取向，因此我们能够通过测量整个阵列来研究单个纳米颗粒组装体的磁性。我们系统地研究了盘状和棒状纳米颗粒组装体的两种磁各向异性之间的相互作用。当磁性纳米颗粒的易轴沿棒状纳米颗粒组装体的长轴取向时，获得了最大的磁各向异性。