title: Manipulate the magnetic anisotropy of nanoparticle assemblies in arrays.
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.
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China. Electronic address: halong@uestc.edu.cn.
authors.forename: Tianlong
authors.initials: T
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Yuanpeng
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Dainan
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang 315201, China.
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Zhan
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Qiye
authors.initials: Q
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Yulong
authors.initials: Y
authors.lastname: Liao
authors.affiliation: Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang 315201, China.
authors.forename: Yali
authors.initials: Y
authors.lastname: Xie
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Huaiwu
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Lichuan
authors.initials: L
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Yingli
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Tingchuan
authors.initials: T
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhong
keywords: Hierarchical self-assembly; Magnetic anisotropy; Magnetic nanoparticles; Magnetocrystalline anisotropy; Shape anisotropy