Effect of exchange-coupling interaction on domain pinning mechanism in nanometer permanent materials

2011 ◽  
Vol 509 (21) ◽  
pp. 6139-6141 ◽  
Author(s):  
Sun Yan ◽  
Wan Yunfang
Keyword(s):  
Exchange Coupling ◽  
Pinning Mechanism ◽  
Coupling Interaction ◽  
Exchange Coupling Interaction ◽  
Domain Pinning

scholarly journals Investigation on Domain Pinning Mechanism in Nanometer Hard Magnetic Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-4
Author(s):  
Yan Sun ◽  
Qingbao Ni
Keyword(s):  
Magnetic Materials ◽  
Coupling Coefficient ◽  
Exchange Coupling ◽  
Hard Magnetic Materials ◽  
Wall Width ◽  
Pinning Mechanism ◽  
Coupling Interaction ◽  
Control Range ◽  
Exchange Coupling Interaction ◽  
Domain Pinning

The domain pinning mechanism was investigated in nanometer hard magnetic materials. The pinning fields of domain wall at different inhomogeneities were studied respectively. And exchange-coupling coefficient αex was investigated too. The results showed that αex is proportional to the ratio of inhomogeneity thickness ro to wall width δm for narrow inhomogeneity, while it decreases with enhancement of ro/δm for extended inhomogeneity. At a certain value of ro, exchange-coupling coefficient and pinning fields will reach the maximum. Exchange-coupling interaction and pinning fields are greatly influenced by inhomogeneity. Control range of inhomogeneity may obtain higher coercivity.

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

2019 ◽  
Vol 11 (29) ◽  
pp. 26222-26227 ◽  
Author(s):  
Jimin Lee ◽  
Jiwon Kim ◽  
Danbi Kim ◽  
Gyutae Lee ◽  
Yeong-Been Oh ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Core Shell ◽  
Coupling Interaction ◽  
One Dimensional ◽  
Exchange Coupling Interaction

Effect of exchange-coupling interaction on anisotropy of grain in nanoscaled magnets

2007 ◽  
Vol 141 (3) ◽  
pp. 156-159 ◽  
Author(s):  
Yan Sun ◽  
Ru-wei Gao ◽  
Guang-bing Han ◽  
Min Liu ◽  
Bai-ping Han
Keyword(s):  
Exchange Coupling ◽  
Coupling Interaction ◽  
Exchange Coupling Interaction

Size-Dependence of Effective Anisotropy and Coercivity in Nanocomposite Permanent Magnetic Materials

2011 ◽  
Vol 217-218 ◽  
pp. 1689-1692
Author(s):  
Jia Jun Guo ◽  
Zhong Wei Wang ◽  
Jian Zhang ◽  
Hong Wei Li ◽  
Xu Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Physical Model ◽  
Magnetic Materials ◽  
Exchange Coupling ◽  
Size Dependence ◽  
Strong Dependence ◽  
Statistical Average ◽  
Effective Anisotropy ◽  
Coupling Interaction ◽  
Exchange Coupling Interaction

Take into account different degree of exchange-coupling interaction between soft and hard grains, the effective anisotropy and coercivity in nanocomposite permanent magnetic materials has been investigated by adopting a statistical average physical model. The calculated results show a strong dependence of effective anisotropy and coercivity on the grain size in these materials. Using this model, the serious deterioration of coercivity in experiments especially when the grain size is less then 15nm could be explained in terms of the dramatic drop of the effective anisotropy in nanocomposites.

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