2014
DOI: 10.1063/1.4866234
|View full text |Cite
|
Sign up to set email alerts
|

High-frequency permeability of Ni and Co particle assemblies

Abstract: A coaxial transmission line was constructed, characterized, and calibrated for the frequency dependent measurement of complex relative permeability (l r ) and complex permittivity (e r ). The permeability of Ni powder with a grain size of < 1 lm was measured as a function of packing density to verify the system performance. 8-10 nm diameter Co nanoparticles were synthesized, dried to a powder, and measured. The real part of the permeability for the Co nanoparticles decreased over time as a result of oxidation,… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1

Citation Types

0
1
0

Year Published

2016
2016
2023
2023

Publication Types

Select...
5

Relationship

0
5

Authors

Journals

citations
Cited by 6 publications
(1 citation statement)
references
References 14 publications
0
1
0
Order By: Relevance
“…Many efforts have been made to develop electromagnetic wave-absorbing (EMA) materials to meet the increasing requirements for absorbing electromagnetic waves. These efforts have cultivated a great scope wherein various materials have been explored as EMA fillers. Among these materials, ferromagnetic metal/alloy particles possess unique properties, such as a high saturation magnetization ( M s ), a high Curie temperature ( T c ), and composition controllability, which endow them with a superior potential to present high and tailorable electromagnetic properties in the gigahertz (GHz) range. However, these intrinsic superiorities have not been fully revealed because of various obstacles, including the eddy current effect, low filling fraction, or decay. For instance, eddy current in a single ferromagnetic particle or local aggregations may induce an extremely high permittivity but decreased permeability, leading to deteriorated electromagnetic matching. On the other hand, the filling ratio in EMA coatings is usually limited to a low level, which restricts improvement of the coatings’ permeability. Additionally, ferromagnetic nanoparticles are prone to oxidization when exposed to a high temperature or corrosive environment, resulting in a degenerated EMA performance during the serving process. ,, The eddy current effect as well as dielectric loss is related to conductivity ,, and particle size . Ferromagnetic resonance is highly sensitive to particle morphology and particle–particle distance. , The microstructure design of ferromagnetic particles can influence their conductivity, dispersion, and ferromagnetic properties; thus, it would be beneficial to adjust their EMA properties.…”
Section: Introductionmentioning
confidence: 99%
“…Many efforts have been made to develop electromagnetic wave-absorbing (EMA) materials to meet the increasing requirements for absorbing electromagnetic waves. These efforts have cultivated a great scope wherein various materials have been explored as EMA fillers. Among these materials, ferromagnetic metal/alloy particles possess unique properties, such as a high saturation magnetization ( M s ), a high Curie temperature ( T c ), and composition controllability, which endow them with a superior potential to present high and tailorable electromagnetic properties in the gigahertz (GHz) range. However, these intrinsic superiorities have not been fully revealed because of various obstacles, including the eddy current effect, low filling fraction, or decay. For instance, eddy current in a single ferromagnetic particle or local aggregations may induce an extremely high permittivity but decreased permeability, leading to deteriorated electromagnetic matching. On the other hand, the filling ratio in EMA coatings is usually limited to a low level, which restricts improvement of the coatings’ permeability. Additionally, ferromagnetic nanoparticles are prone to oxidization when exposed to a high temperature or corrosive environment, resulting in a degenerated EMA performance during the serving process. ,, The eddy current effect as well as dielectric loss is related to conductivity ,, and particle size . Ferromagnetic resonance is highly sensitive to particle morphology and particle–particle distance. , The microstructure design of ferromagnetic particles can influence their conductivity, dispersion, and ferromagnetic properties; thus, it would be beneficial to adjust their EMA properties.…”
Section: Introductionmentioning
confidence: 99%