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Defect-tuning exchange bias of ferromagnet/antiferromagnet core/shell nanoparticles by numerical study
Zhongquan Mao1, Xiaozhi Zhan, Xi Chen
1Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China.
Non-magnetic defects influence exchange bias (EB) in core/shell nanoparticles. Defect positioning and concentration are key to tuning EB effects for potential applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Exchange bias (EB) is a crucial phenomenon in ferromagnet (FM)/antiferromagnet (AFM) systems.
- Understanding defect influences is vital for controlling magnetic properties.
Purpose of the Study:
- To investigate the impact of non-magnetic defects on the EB of FM/AFM core/shell nanoparticles.
- To explore how defect location and concentration affect EB and coercive fields.
Main Methods:
- Monte Carlo simulations were employed to model the system.
- The study analyzed the effects of defects at interfaces and within the AFM shell.
Main Results:
- Defects at FM/AFM interfaces decrease EB field and increase coercive field by reducing interface coupling.
- Defects within the AFM shell exhibit non-monotonic EB field and monotonic coercive field dependence on concentration.
- A microscopic mechanism similar to the domain state model was identified.
Conclusions:
- Non-magnetic defects offer a tunable parameter for optimizing EB effects in core/shell nanoparticles.
- Strategic placement and control of defects can enhance EB performance for technological applications.
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