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Investigation of intergrain exchange coupling interaction of nanocrystalline permanent magnets by numerical simulation

Rong Chuan-Bing Zhang Hong-Wei Chen Ren-Jie He Shu-Li Zhang Shao-Ying Shen Bao-Gen

Investigation of intergrain exchange coupling interaction of nanocrystalline permanent magnets by numerical simulation

Rong Chuan-Bing, Zhang Hong-Wei, Chen Ren-Jie, He Shu-Li, Zhang Shao-Ying, Shen Bao-Gen
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  • Received Date:  31 May 2004
  • Accepted Date:  23 August 2004
  • Published Online:  03 April 2005

Investigation of intergrain exchange coupling interaction of nanocrystalline permanent magnets by numerical simulation

  • 1. 中国科学院物理研究所磁学国家重点实验室,北京 100080

Abstract: The initial curves, demagnetization curves and recoil curves of Pr2Fe14B and Pr2Fe14B-α Fe nanocrystalline permanent magnets have been calculated by micromagnetic finite_element method. The validity of δm(H)curves, which can be used to determine the strength of intergrain exchange coupling interaction (IGEC), is approved by the calculated results. It is found that IGEC weakens with increasing grain size D for single-phase nanocrystalline and nanocomposite permanent magnets. Thus, the demagnetization curve shows a two-phase behavior and the δm(H) curve shows two peaks for the nanocomposite sample with D=20nm.The peak at small field can be attributed to the exchange interaction between the magnetic hard and soft grains, while the peak at large field may be due to the IGEC among hard grains.

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