Influence of Microstructure on the DC-Bias-Superposition Characteristics of NiZn Ferrites

The influence of microstructure on the magnetic properties, especially the dc-bias-superposition characteristics, of NiZn ferrites has been investigated. The value of saturation magnetic flux density ( B s ) first increased and then changed little with variation of the sintered density, and showed l...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2011-10, Vol.47 (10), p.4332-4335
Main Authors: Tang, Xiaoli, Zhang, Huaiwu, Su, Hua, Zhong, Zhiyong, Bai, Feiming
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
DC-bias-superposition
Exact sciences and technology
ferrite
Ferrites
Grain size
Magnetic domains
Magnetic properties
Materials science
Microstructure
Other topics in materials science
Permeability
Physics
Saturation magnetization
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Summary:The influence of microstructure on the magnetic properties, especially the dc-bias-superposition characteristics, of NiZn ferrites has been investigated. The value of saturation magnetic flux density ( B s ) first increased and then changed little with variation of the sintered density, and showed little relation to the microstructure. Coercivity ( H c ) decreased continuously with increasing average grain size. Δ B ( B s -remanence) first increased with increasing average grain size, but then gradually decreased when abnormal grain growth prevailed. The incremental permeability (permeability with magnetic field superposition) was influenced by both Δ B and H c . A sample with higher Δ B and H c favored the attainment of a higher incremental permeability. The Q -factor was mainly determined by the sintered density and microstructure. To sum up, a uniform and dense microstructure with relatively small average grain size is favorable for obtaining better dc-bias-superposition characteristics, including permeability and Q -factor.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2011.2157307