4.8 Article

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm2Co17/FeCo Core-Shell Nanomagnets

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 29, Pages 26222-26227

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02966

Keywords

permanent magnet; Sm2Co17/FeCo nanocomposite magnets; core-shell nanomagnet; exchange-coupling effect; shape tuning; electroless plating

Funding

  1. Future Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2016M3D1A1027836]
  2. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2015R1A5A1037548]
  3. National Research Foundation of Korea [2015R1A5A1037548] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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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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