Exchange-Coupling Interaction in Zero- and One-Dimensional Sm2Co17/FeCo Core-Shell Nanomagnets
- Authors
- Lee, Jimin; Kim, Jiwon; Kim, Danbi; Lee, Gyutae; Oh, Yeong-Been; Hwang, Tae-Yeon; Lim, Jae-Hong; Cho, Hong-Baek; Kim, Jongryoul; Choa, Yong-Ho
- Issue Date
- Jul-2019
- Publisher
- American Chemical Society
- Keywords
- permanent magnet; Sm2Co17/FeCo nanocomposite magnets; core-shell nanomagnet; exchange-coupling effect; shape tuning; electroless plating
- Citation
- ACS Applied Materials and Interfaces, v.11, no.29, pp.26222 - 26227
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 11
- Number
- 29
- Start Page
- 26222
- End Page
- 26227
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/182057
- DOI
- 10.1021/acsami.9b02966
- ISSN
- 1944-8244
- Abstract
- Rare-earth-based core shell spring nanomagnets have been intensively studied in the permanent magnet industry. However, the inherent agglomeration characteristics of zero-dimensional (0-D) magnetic nanoparticles are an issue in practical fabrication of magnetic nanocomposites due to deterioration in exchange-coupling interactions, resulting in inferior magnetic performance. Here, with an aim to overcome the structural limitations, we report a new type of SmCo/FeCo core shell nanomagnet with a well-dispersed one-dimensional (1-D) structure prepared by a combination of electrospinning and electroless plating processes. An FeCo layer with a tailored thickness on nanoscale SmCo was produced to achieve a sufficient exchange-coupling effect. The influence of electroless plating time on the microstructure of fibers was discussed, and comparisons were made as a function of the magnet shape. A 1-D SmCo/FeCo spring nanomagnet having a core diameter ranging from 150 to 200 nm and a shell thickness of 15-20 nm showed a potent exchange coupling effect compared with its 0-D counterpart. This effectively reduced self-aggregation and further showed a remarkable enhancement in (BH)max (above 45.7%). We think that this novel structure marks a new era in the exchange-spring magnet industry and may overcome the limitations of traditional core shell nanomagnets.
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