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

被引：4

作者：

Rong, CB ^{[1
]}

Zhang, HW ^{[1
]}

Chen, RJ ^{[1
]}

He, SL ^{[1
]}

Zhang, SY ^{[1
]}

Shen, BG ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China

来源：

ACTA PHYSICA SINICA | 2004年 / 53卷 / 12期

关键词：

nanocomposite permanent magnet; intergrain exchange coupling interaction; delta m( H) curves;

D O I：

10.7498/aps.53.4353

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The initial curves, demagnetization curves and recoil curves of Pr-2 Fe-14 B and Pr-2 Fe-14 B/alpha-Fe nanocrystalline permanent magnets have been calculated by micromagnetic finite-element method. The validity of delta m ( 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 delta m ( H) curve shows two peaks for the nanocomposite sample with D 20 nm. 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.

引用

页码：4353 / 4358

页数：6

共 22 条

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