Effect of Exchange Interactions on the Coercivity of SmCo5 Nanoparticles Made by Cluster Beam Deposition

IF 19 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2013-02-06 DOI:10.1002/adfm.201201353

O. Akdogan, W. Li, B. Balasubramanian, D. J. Sellmyer, G. C. Hadjipanayis

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引用次数: 38

Abstract

Single crystal SmCo₅ nanoparticles with an average size of 3.5 nm are produced by cluster-beam deposition. When deposited without matrix, the nanoparticles showed a super-paramagnetic behavior with a blocking temperature of 145 K. Dispersion of the SmCo₅ nanoparticles in a carbon matrix results in an increase in both the coercivity and the blocking temperature. Room temperature coercivities as high as 12 kOe are obtained for the first time in mono-layers of SmCo₅ nanoparticles dispersed in C matrix. δM plots show that the interactions in the samples are of exchange type, which can decrease the overall effective anisotropy and coercivity according to the random-anisotropy model. Coercivity is found to be inversely proportional to the packing density of the particles. SmCo₅ nanoparticles with high coercivity are potential candidates for the next generation ultra high-density magnetic recording media.

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交换相互作用对簇束沉积SmCo5纳米颗粒矫顽力的影响

采用团束沉积法制备了平均尺寸为3.5 nm的SmCo5单晶纳米颗粒。当无基体沉积时，纳米颗粒表现出超顺磁性，阻滞温度为145 K。SmCo5纳米颗粒在碳基体中的分散导致矫顽力和阻挡温度的增加。首次获得了分散在C基体中的SmCo5纳米颗粒的室温矫顽力高达12 kOe。δM图显示，样品中的相互作用为交换型，根据随机-各向异性模型，交换型相互作用降低了整体有效各向异性和矫顽力。发现矫顽力与颗粒的堆积密度成反比。具有高矫顽力的SmCo5纳米颗粒是下一代超高密度磁记录介质的潜在候选材料。

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

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.