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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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Electromagnetic Wave Absorption Characteristics of Patterned BaTiO
3
/BaZnCoFe
16
O
27
Bilayers with Controlled Layer Thickness and Pattern Geometry
패턴형 BaTiO
3
/BaZnCoFe
16
O
27
2층 흡수체의 구조 제어에 따른 광대역 전자기파 흡수 특성 연구
Jae-Hee Heo, Young-Min Kang, Sang-Min Lee허재희, 강영민, 이상민
Korean J. Met. Mater.
2025;63(12):955-967. Published online 2025 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.12.955
Abstract
This study explores the electromagnetic (EM) wave absorption behavior of a bilayer structure comprising BaZnCoFe
16
O
27
-epoxy (BZCFO) and BaTiO
3
-epoxy (BT). BZCFO exhibits magnetic loss via ferromagnetic resonance (FMR) originating from BaZnCoFe
16
O
27
particles, while BT provides high permittivity and dielectric loss due to the ferroelectric nature of BaTiO
3
particles. The composite samples.....
More
Enhanced Electromagnetic Wave Absorption in Hexaferrite/LSMO Bilayers: Optimization of Structural Design Using a High Frequency Software Simulation
Jae-Hee Heo, Tae-Woo Lee, Young-Min Kang, Sang-Min Lee
Korean J. Met. Mater.
2024;62(11):868-878. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.868
Abstract
In this study, the electromagnetic (EM) wave absorption properties of a two-layered structure composed of La
0.7
Sr
0.3
MnO
3
-epoxy (10 wt.%) (LSMO) and SrFe
9.5
Co
1.25
Ti
1.25
O
19
-epoxy (10 wt.%) (SFCTO), both exhibiting distinct high-frequency magnetic and dielectric properties, were investigated using a High Frequency Simulation Software (HFSS) simulation tool. LSMO had a high dielectric constant (ε'.....
More
Crossref 1
Microwave Absorption Characteristics of M
2+, 3+
(M = Mn
3+
, Zn
2+
, Ni
2+
)-substituted Sr
3
Co
2
Fe
24
O
41
Hexaferrite Composites
M
2+, 3+
(M = Mn
3+
, Zn
2+
, Ni
2+
)이 치환된 Sr
3
Co
2
Fe
24
O
41
hexaferrite 복합체의 전자기파 흡수 특성
Jae-Hee Heo, Young-Min Kang허재희, 강영민
Korean J. Met. Mater.
2024;62(8):645-655. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.645
Abstract
Mn, Zn, Ni-substituted Z-type hexaferrites, Sr
3
Co
2
Fe
24
O
41
(Sr
3
Co
2
Fe
24-x
Mn
x
O
41
, Sr
3
Co
2-y
Zn
y
Fe
24
O
41
, Sr
3
Co
1-z
Ni
z
ZnFe
24
O
41
), were prepared by sol-gel synthesis processes and their high-frequency magnetic, dielectric and electromagnetic (EM) wave absorption characteristics were investigated. Substituting Mn for Fe by
x
= 0.5 maintained the single-phase Z phase while shifting the μ' , μ″ spectra towards lower.....
More
Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of La
0.7
Sr
0.3
MnO
3
La
0.7
Sr
0.3
MnO
3
의 합성, 특성 평가 및 전자기파 흡수 특성
Jae Hee Heo, Young-Min Kang허재희, 강영민
Korean J. Met. Mater.
2023;61(3):183-189. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.183
Abstract
Perovskite manganese La
0.7
Sr
0.3
MnO
3
(LSMO) powders were prepared by sol-gel synthesis and calcination in the temperature (
T
) range of 500~1200 o C and their structures and electromagnetic (EM) wave absorption properties were investigated. X-ray diffraction (XRD) analysis revealed that the crystalline perovskite phase can be formed at
T
≥ 600
o
C......
More
Web of Science 3
Crossref 4
Development of a High-Performance-Ferrite Magnet Fabrication Process without Sintering Additives
소결 첨가제 없는 고특성 페라이트 영구자석 공정 개발
Pyeong-Yeol Yu, Min-Ho Kim, Young-Min Kang유평열, 김민호, 강영민
Korean J. Met. Mater.
2021;59(8):551-559. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.551
Abstract
Sintered M-type hexaferrites with the chemical formula of Sr
0.3
Ca
0.4
La
0.3
Fe
9.8
Co
0.2-x
Mn
x
Si
0.135
O
19-d
(
x
= 0, 0.05, 0.1, 0.2) and Sr
0.3
Ca
0.4
La
0.3
Fe
9.8-y
Co
0.2
Mn
y
Si
0.135
O
19-d
(
y
= 0.05, 0.1, 0.2) were prepared by conventional solid station reaction routes. A high sintering density of more than 95% of the theoretical density was achieved in all hexaferrite samples when calcination.....
More
Web of Science 3
Crossref 3
Fabrication and Electromagnetic wave absorption Properties of Co-Cu-substituted Ni-Zn Spinel Ferrite-epoxy Composites
Co, Cu가 치환된 Ni-Zn 스피넬 페라이트-에폭시 복합체의 제조와 전자기파 흡수 특성
Ji-Eun Yoo, Young-Min Kang유지은, 강영민
Korean J. Met. Mater.
2020;58(12):887-895. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.887
Abstract
Spinel ferrites (Ni
0.5
Zn
0.5
)
1-
x-y
Co
x
Cu
y
Fe
2
O
4
, (
x
= 0 and
y
= 0,
x
= 0.2 and
y
= 0,
x
= 0.1 and
y
= 0.1,
x
= 0 and
y
= 0.2) were prepared by sol-gel method and post-annealed at 1100
o
C. The grain growth of the sample is very sensitive.....
More
Web of Science 6
Crossref 3
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