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Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers
Wenjing Si1, G P Zhao1, N Ran1
1College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610068, China.
Scientific Reports
|November 21, 2015
Summary
Interface atomic diffusion significantly reduces coercivity in hard/soft permanent magnets. This study demonstrates how interface layer formation decreases coercivity by 50%, impacting magnetic properties and offering a method for enhancement.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Hard/soft permanent magnets offer potential for high energy products.
- Experimental magnetic properties often fall short of theoretical predictions due to lower coercivity.
- Understanding coercivity limitations is crucial for advanced magnet development.
Purpose of the Study:
- To investigate the impact of interface atomic diffusion on coercivity in hard/soft permanent magnets.
- To quantify the coercivity reduction caused by interface layer formation.
- To propose a method for enhancing coercivity in these magnetic systems.
Main Methods:
- Utilized three-dimensional (3D) micromagnetic simulations with OOMMF software.
- Applied a derived formula for the pinning field in hard/soft multilayers.
- Analyzed interface atomic diffusion effects on coercivity.
Main Results:
- Demonstrated that interface atomic diffusion deteriorates coercivity.
- Quantified a coercivity decrease of approximately 50% due to interface layer formation.
- Identified this interface effect as the cause for lower experimental coercivity in permanent magnets.
Conclusions:
- Interface atomic diffusion is a primary factor limiting coercivity in hard/soft permanent magnets.
- A method to enhance coercivity has been proposed, aligning with experimental findings.
- The findings are applicable to both permanent magnets and exchange-coupled-composite (ECC) media.
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